Premium Essay

Stats Exercise 31

In: Other Topics

Submitted By jinkens006
Words 673
Pages 3
1. What are the two groups whose results are reflected by the t ratios in Tables 2 and 3?
Table 2 reflects the program’s effects on cardiovascular risk factors.
Table 3 reflects the program’s effects on health behavior.
2. Which t ratio in Table 2 represents the greatest relative or standardized difference between the pretest and 3 months outcomes? Is this t ratio statistically significant? Provide a rationale for your answer.
The t ratio for Table 2 represents the greatest relative or standardized difference between the pre-test and 3 months outcomes because the value of t test statistics is bigger than any other group.
This ratio is statistically significant because the p-value corresponding to this group is less than 0.05.
3. Which t ratio listed in Table 3 represents the smallest relative difference between the pretest and 3 months? Is this t ratio statistically significant? What does this result mean?
The T-ratio is 0.80.
This value is not statistically significant.
The value is less than 1.96.
This means the program has no effect on health behaviors. 4. What are the assumptions for conducting a t-test for dependent groups in a study? Which of these assumptions do you think were met by this study?
Several assumptions for t-test for dependent/matched groups in a study are applied. It is assumed that the difference between the two groups of the dependent t-test is normally distributed.
The dependent variable is interval or ratio.
Any independent variable consists of one group or two “matched pair” groups.
All subjects are assumed to have been surveyed the same and data collection was unbiased.
The assumption that was met in this study is the normal distribution. 5. Compare the 3 months and 6 months t ratios for the variable Exercise from Table 3. What is your conclusion about the long-term effect of the health-promotion

Similar Documents

Premium Essay

Data Analytics

...Exercise A.1 : Oil Demand and GDP Relationships Exercise A.1 : Oil Demand and GDP Relationships Regression Statistics | Multiple R | 0.973261851 | R Square | 0.947238631 | Adjusted R Square | 0.946414235 | Standard Error | 611.7650139 | Observations | 66 | | |   | Coefficients | Standard Error | t Stat | P-value | Intercept | -7.962621221 | 83.69853866 | -0.095134531 | 0.924505216 | GDP Data (USD $M) | 0.001155711 | 3.40948E-05 | 33.89703095 | 1.32639E-42 | Table 1. Oil Consumption and GDP GDP regression analysis results Table 1 above shows that 94.7% of the 2010 oil demand of selected countries can be explained by the explanatory variable (2010 GDP growth of those countries). The remaining 5.3% of the oil demand in 2010 is unknown and cannot be explained using the linear regression model Oil demand = 1 + (2*GDP) + Residual. Additionally, a $ USD 1,155.71 increase in a country’s GDP will lead to a 1,000 barrel per day increase in that country’s oil demand, assuming all other variables are held fixed. Figure 1. Oil consumption by country The graph above shows the predicted vs. actual oil consumption by country using GDP and oil consumed (‘000 barrel per day) data for 2010. Based from the above, the U.S. was the top oil consumer in 2010. It consumed 16.7 M barrels per day - exceeding the benchmark result from the regression analysis by 15% or 2.4 M barrels per day. Other countries observed to have exceeded their benchmarked oil consumption...

Words: 2838 - Pages: 12

Premium Essay

What

...Part 1. Basic Concepts of Statistics Basic Concepts of Statistics • Every four years, we suffer through an affliction, the presidential election. • Months before the election, public media will inform us that a poll conducted by the opinion research shows that a candidate gains support of more than 50 percent of voters. 1 2 Basic Concepts of Statistics • However, the high percent of support will be with a margin of error of plus or minus 3%. • What is meant by the term margin of error? • If you have an ambition to become president, you need to know something about statistics. • If you cannot perform statistics yourself, it would be better to hire a statistician right away. 3 Testing Hypotheses: One-sample tests • One-sample tests • Null hypothesis: – Ho: μ ≧0 • Alternative hypothesis: – Ha: μ <0 4 What is a Hypothesis? • A hypothesis is a claim (assumption) about a population parameter: – population mean Example: The mean monthly cell phone bill in this city is μ = $42 The Null Hypothesis, H0 • States the claim or assertion to be tested Example: The average number of TV sets in U.S. Homes is equal to three (H0 : µ = 3 ) • Is always about a population parameter, not about a sample statistic H0 : X = 3 6 – population proportion Example: The proportion of adults in this city with cell phones is π = 0.68 5 H0 : µ = 3 The Null Hypothesis, H0 (continued) The Alternative Hypothesis, H1 • Is the opposite of the null hypothesis ...

Words: 23672 - Pages: 95

Premium Essay

Modeling and Forecasting Natural Gas Prices

...Financial Econometrics Modeling and Forecasting Natural Gas Prices Abstract In this project we will model and forecast the natural gas prices over the short-term through the development of the Error Correction Model (ECM). This is presented as the best predictive model among various alternatives. To build this model, we gathered the oil prices to analyze the impact of the changes in these prices on the changes in natural gas prices. The results of the forecasting exercise, carried out using the US Natural Gas 3 Months Strips series, suggest that the forecasting approach can be used to obtain a performance measure for the price. Key words: ARMA; ECM; Cointegration; Forecasting; Natural Gas Prices; Oil Prices. JEL Classification: G17 Index 1- Introduction – The Natural Gas ............................................................................................................... 3 2- Theoretical Framework ............................................................................................................................ 4 3- Empirical Model ....................................................................................................................................... 5 3.1- Methodology – the data .......................................................................................................... 5 3.2- The Model ................................................................................................................................ 6...

Words: 10458 - Pages: 42

Free Essay

Securities Act 1933

...Exemption From State Regulation of Securities Offerings. Sec. 19. Special Powers of Commission. Sec. 20. Injunctions and Prosecution of Offenses. Sec. 21. Hearings by Commission. Sec. 22. Jurisdiction of Offenses and Suits. Sec. 23. Unlawful Representations. Sec. 24. Penalties. Sec. 25. Jurisdiction of Other Government Agencies Over Securities. Sec. 26. Separability of Provisions. Sec. 27. Private Securities Litigation. Sec. 27A. Application of Safe Harbor for Forward-Looking Statements. Sec. 27B. Conflicts of Interest Relating to Certain Securitizations. Sec. 28. General Exemptive Authority. Schedule A. Schedule B. SHORT TITLE SEC. 1. This title may be cited as the ‘‘Securities Act of 1933’’. (May 27, 1933, ch. 38, title I, Sec. 1, 48 Stat. 74.) DEFINITIONS SEC. 2. (a) DEFINITIONS.—When used in this title,...

Words: 43490 - Pages: 174

Premium Essay

Financial Analysis of Hi-P International

...Hi-P International Ltd. Singapore Financial Analysis Finance 101 G11 Group 9 Table of Contents EXECUTIVE SUMMARY 3 INTRODUCTION 4 MACRO-ECONOMIC ANALYSIS 4 INDUSTRY OUTLOOK 3 INDUSTRY PLAYERS 3 HI-P REVISITED 4 FINANCIALS 5 RATIOS 5 VALUATION 6 CORPORATE VALUATION MODEL 7 DIVIDEND DISCOUNT MODEL ...

Words: 5052 - Pages: 21

Free Essay

Trait Paper

...clients were scanned into our servers and then given back to the client. They required that I have PDF files for all numbers that I used in tax return. Not just that but on a line by line basis per tax form used. The point I am trying to make is that I still needed discipline even though I was previously trained in tax accounting. Not just that you might have to adapt your discipline depending on the type of changes the company goes through with new technology advancements and improvements. According to the state of Illinois my trait discipline encompass the rules of professional conduct. People in the professional world that reside in the state of Illinois should use the professional conduct. Here is the general summary for the stats of Illinois: “The Rules of Professional Conduct are rules of reason. They should be interpreted with reference to the...

Words: 1263 - Pages: 6

Free Essay

Statistics for Management

...org/publications/jse/v17n1/mclaren.html Note to Instructors: Our students, like many introductory business statistics students, have access to SPSS and Minitab so in most cases these exercises provide specific instructions for these two packages. We have also included instructions for Excel 2007. While we are cognizant of the issues with using Excel for statistical analyses, we also realize its simplicity for basic functions such as graphing, and we use it in our classes along with Minitab and SPSS because we feel that business students should be proficient in its use. We used SPSS version 15, Minitab version 15, and Excel 2007 to write the following instructions. If your students will be using other versions of these softwares or if you prefer that your students use different statistical software, you will need to edit the instructions accordingly before distributing to your students. Exercise 1: Data Retrieval and Graphing Learning Objectives: 1. Locate and retrieve data from a web site. 2. Place retrieved data into Excel and format appropriately. (This step is recommended because the format from the website is not easily imported directly into SPSS and Minitab). 3. Create and format a time series plot in SPSS, Minitab, Excel or other software. Instructions for the students: For this exercise you will use movie box office data found at http://www.the-numbers.com/. You will locate data for a specific movie, bring the data to Excel to format it, and then create a time...

Words: 7158 - Pages: 29

Free Essay

2009 Authorization Act

...intelligence and intelligence-related activities of the United States Government, the Community Management Account, and the Central Intelligence Agency Retirement and Disability System, and for other purposes. 1 Be it enacted by the Senate and House of Representa- 2 tives of the United States of America in Congress assembled, 3 4 SECTION 1. SHORT TITLE; TABLE OF CONTENTS. (a) SHORT TITLE.—This Act may be cited as the 5 ‘‘Intelligence Authorization Act for Fiscal Year 2009’’. 6 (b) TABLE OF CONTENTS.—The table of contents for hsrobinson on PROD1PC76 with BILLS 7 this Act is as follows: Sec. 1. Short title; table of contents. Sec. 2. Definitions. TITLE I—BUDGET AND PERSONNEL AUTHORIZATIONS VerDate Aug 31 2005 21:15 Jul 18, 2008 Jkt 069200 PO 00000 Frm 00001 Fmt 6652 Sfmt 6211 E:\BILLS\H5959.PCS H5959 2 Sec. Sec. Sec. Sec. Sec. Sec. 101. 102. 103. 104. 105. 106. Authorization of appropriations. Classified Schedule of Authorizations. Personnel ceiling adjustments. Intelligence Community Management Account. Limitation on the use of covert action funds. Prohibition on use of funds to implement ‘‘5 and out’’ program of the Federal Bureau of Investigation. TITLE II—CENTRAL INTELLIGENCE AGENCY RETIREMENT AND DISABILITY SYSTEM Sec. 201. Authorization of appropriations. Sec. 202. Technical modification to mandatory retirement provision of the Central Intelligence Agency Retirement Act. TITLE...

Words: 24825 - Pages: 100

Free Essay

Viena Convention

...UNITED NATIONS United States of America Vienna Convention on Relations and Optional Protocol on Disputes Multilateral—Diplomatic Relations—Apr. 18,1961 UNITED NATIONS CONFERENCE ON DIPLOMATIC INTERCOURSE AND IMMUNITIES VIENNA CONVENTION ON DIPLOMATIC RELATIONS UNITED NATIONS 1961 MULTILATERAL Vienna Convention on Diplomatic Relations and Optional Protocol on Disputes Done at Vienna April 18, 1961; Ratification advised by the Senate of the United States of America September 14, 1965; Ratified by the President of the United States of America November 8, 1972 Ratification of the United States of America deposited with the Secretary-General of the United Nations November 13, 1972; Proclaimed by the President of the United States of America November 24, 1972; Entered into force with respect to the United States of America December 13, 1972. BY THE PRESIDENT OF THE UNITED STATES OF AMERICA A PROCLAMATION CONSIDERING THAT: The Vienna Convention on Diplomatic Relations and the Optional Protocol Concerning the Compulsory Settlement of Disputes were opened for signature on April 18, 1961 and were signed on behalf of the United States of America on June 29, 1961, certified copies of which are hereto annexed; The Senate of the United States of America by its resolution of September 14, 1965, two-thirds of the Senators present concurring therein, gave its advise and consent to ratification of the Convention and the Optional Protocol; On November 8, 1972 the President of the United...

Words: 16844 - Pages: 68

Free Essay

Ihy Jhssdkl Kldvhsdv

...Resources |Listening |Reading |Class Reading |Writing |Final test 1 |Final test 2 | |Ex 1-2 Barrons |Test 1: |RP1 T1T3 (cam5) |task1 |Camb 6 test 1 |From old handbook | |numbers/letters |Cambr 7 test 1 |RP2 T1T2 (cam5) |macmillan (macarter) |Reading: | | |Ex.3 Camb 7 Section 1 |Test 2: |RP3 T4T1 (cam5) |task 2 |Camb 7 test 2 | | |Ex 4. Emotions Barrons |Cambr 7 test 4 |RP4 Mozart (macmillan) |Kaplan (celeb) |Writing | | |Ex. 4 |Test 3 |RP5 T4T3 (cam5) |simon |Chicken consumption | | |-camb 7 test 4 sect3 |Plus 2 (old) |RP6 T2T1 (cam6) |dcielts |(camb 7 test 2) | | |-sect 3 from previous |Test 4: | |Sample essays |Media essay | | |final test1 |Plus 2 (old) | |1 celebrities |(vocabulary for | | |Ex “time” “frequency” |Test 5: | |2 TV |ielts unit 19) | | |from barrons |Plus 2 (old) ...

Words: 4223 - Pages: 17

Free Essay

Gerontology

...of breath while preforming everyday activities and has noticed that her legs have been “getting bigger”. Patient had been sleeping with 3-4 pillows a night for comfort and occasionally sleeping in a recliner. Patient states this evening she got up to use the restroom and had a sudden onset of severe shortness of breath. Felt as though she wasn’t moving any air. Patient called 911. The paramedics on scene established IV access and medicated patient with 40 of furosemide and Nitroglycerin sublingual 0.4 mg times 3 doses. Patient was placed on CPAP and brought to the ER. Upon arrival CPAP was continued, a nitroglycerin infusion was started at 20mcg/min. Additional IV access was established and labs were obtained. Stat EKG and Chest Xray were completed. Additional dose of furosemide 80mg was administered IV push and patient was provided with an indwelling foley catheter which is draining clear yellow urine. Past Medical History is significant for Hypertension, Diabetes, Congestive Heart failure, and Atrial Fibrillation with two unsuccessful cardioversions. Medications: Patient currently taking Furosemide, Lisinopril, Digoxin, Metformin, and Glyburide. Patient unable to recall dosages. Past Surgical History is significant for cesarian sections x 3 and ORIF of left hip 8 years ago. Social History: Patient is a 1 pack per day smoker x 40 years. Consumes alcohol on a social basis. Denies using any illicit drugs. Patient...

Words: 1602 - Pages: 7

Premium Essay

Coconut Charcoal

...THE USE OF BIOMASS WASTES TO FABRICATE CHARCOAL SUBSTITUTES IN KENYA Feasibility Study forming part of the Shell Foundation-supported project on charcoal briquetting in Kenya March 2004 Chardust Ltd. P.O. Box 24371 Nairobi and Spectrum Technical Services P.O. Box 69993 Nairobi Executive Summary This study was designed by Chardust Ltd. and implemented jointly by Chardust and Spectrum Technical Services, a Nairobi-consulting firm. The aim was to determine the viability of producing briquetted charcoal fuel from biomass wastes in Kenya. The study was funded by the Shell Foundation and conducted over a two month period in late 2003. The viability of producing fuel commercially from biomass wastes was assessed from four perspectives: (a) Availability: Existence and accessibility of biomass in bulk, preferably with no competing uses. The study began with a list of 28 potential wastes, which was narrowed down to 20 and then to just ten, according to a ranking system based upon basic availability and accessibility. (b) Conversion Potential: Physical suitability for drying, carbonisation and briquetting. Samples of the ten short-listed wastes were sourced and delivered to Chardust in Nairobi, where production trials were carried out. Based on these trials, a ranking system was devised for comparing the wastes in terms of their suitability for fuel production. (c) Fuel Quality: Energy value and general performance of fabricated fuel. The third part of the study comprised...

Words: 14061 - Pages: 57

Free Essay

Matlab

...An Introduction to Matlab for Econometrics John C. Frain TEP Working Paper No. 0110 February 2010 Trinity Economics Papers Department of Economics Trinity College Dublin An Introduction to MATLAB for Econometrics John C. Frain. February 2010 ∗ Abstract This paper is an introduction to MATLAB for econometrics. It describes the MATLAB Desktop, contains a sample MATLAB session showing elementary MATLAB operations, gives details of data input/output, decision and loop structures, elementary plots, describes the LeSage econometrics toolbox and maximum likelihood using the LeSage toolbox. Various worked examples of the use of MATLAB in econometrics are also given. After reading this document the reader should be able to make better use of the MATLAB on-line help and manuals. Contents 1 Introduction 1.1 1.2 Preliminaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The MATLAB Desktop . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2.1 1.2.2 1.2.3 1.2.4 1.2.5 1.2.6 1.2.7 1.2.8 1.2.9 ∗ Comments 4 4 6 6 7 8 8 9 9 9 The Command Window . . . . . . . . . . . . . . . . . . . . . . . . The Command History Window . . . . . . . . . . . . . . . . . . . The Start Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Edit Debug window . . . . . . . . . . . . . . . . . . . . . . . . The Figure Windows . . . . . . . . . . . . . . . . . . . . . . . . . . The Workspace Browser . . . . . . . . . . . . . . . . . . . . . . . . The...

Words: 15376 - Pages: 62

Premium Essay

Http: //Philosophy.Wisc.Edu/Hunt/Guncont2.Htm

...The Journal of Legal Medicine, 33:171–199 Copyright C 2012 American College of Legal Medicine 0194-7648 print / 1521-057X online DOI: 10.1080/01947648.2012.657993 THE GOOD, THE BAD AND THE UGLY A 50-STATE SURVEY EXPLORING FEDERAL AND STATE FIREARM REGULATIONS RELATED TO MENTAL HEALTH Jason Sterzer* The right of the people to keep and bear arms shall not be infringed, and this without any qualification as to their condition or degree, as is the case in the British government. This may be considered as the true palladium of liberty . . . . The right of self-defense is the first law of nature; in most governments it has been the study of rulers to confine this right within the narrowest limits possible. Whenever standing armies are kept up, and the right of the people to keep and bear arms is, under any color or pretext whatsoever, prohibited, liberty, if not already annihilated, is on the brink of destruction.1 INTRODUCTION On April 16, 2007, Seung-Hui Cho went on a murderous rampage at Virginia Tech University, slaughtering 32 people before turning his gun on himself.2 Cho had previously been diagnosed with severe anxiety disorder and declared mentally ill in the Circuit Court of Montgomery County.3 At the time of the shooting, Virginia law prohibited the “purchase, possession, or transportation of any firearm by any person adjudicated ‘legally incompetent,’ ‘mentally incapacitated,’ or ‘incapacitated,’ whose competency or capacity [had] not been * Third-year law student...

Words: 15528 - Pages: 63

Premium Essay

S Budgeting Is a Key Component in Managemnent Short and Long Term Planning

...Marketing Plan Sony Ericsson Mobile Communication | | | | | | | Table of Contents 1. Executive Summary 3 2. Current Marketing Situation 4 2.1 Market Summary 4 2.2 Competition 6 2.3 Product Offering 7 2.4 SWOT Analysis 9 2.5 Critical Issues 10 3. Market Strategy 10 3.1 Misson 10 3.2 Marketing Objectives 13 3.3 Financial Objectives 13 3.4 Target Market 13 3.5 Positioning 15 3.6 Marketing Mix 15 4. Fiancials 18 4.1 Sales Forecast 18 4.2 Expense Forecast 20 5. Controls 21 5.1 Implementations 21 5.2 Contingency Plan 22 6. Conclusion 23 7. References 24 8. Appendixes 30 1. Executive Summary In the following report, we are presenting the marketing strategy of Sony Ericsson Mobile Communication. Sony Ericsson, a limited liability joint venture between Sony Corporation and Telefonakiebolaget LM Ericsson, established in 2001 (Sony Ericsson 2010) and headquarter in London, United Kingdom. It is a global well-known top mobile phones manufacturer and has been in the industry for the past 10 years, offering a wide range of products and their main market emphasizes on mobile phones. It identify its targeted market through different segmentation such as demographic, psychographic and behavioral of its consumers and thus it manufactured series of mobile phones with unique designs and technology features that provide quality camera, music player, web application and entertainment functions (Global Data 2011)...

Words: 6989 - Pages: 28