Free Essay

Submitted By ttrinh79

Words 321

Pages 2

Words 321

Pages 2

(pg. 4)

1.7 Descriptive or inferential

TV Viewing Times. The Nielsen Company collect sand publishes information on the television viewing habits of Americans. Data from a sample of Americans yielded the following estimates of average TV viewing time per month for all Americans 2 years old and older. The times are in hours and minutes (NA, not avail- able). [SOURCE: Nielsen’s Three Screen Report, May 2008]

Answer:

This is an example of a descriptive form of data, because of the summary of the number of Americans 2 years old and older watching TV.

1.14 Offshore Drilling. A CNN/Opinion Research Corporation poll of more than 500 U.S adults, taken in July 2008, revealed that a majority of Americans favor offshore drilling for oil and natural gas; specifically, of those sampled, about 69% were in favor.

Answer:

a. Identify the population and sample for this study.

1. Population is 500 U.S adults

2. Sample- 69%

b. Is the percentage provided a descriptive statistic or an inferential statistic> Explain your answer.

1. Inferential because it is measuring the reliability of conclusions about a population based on information obtained.

1.17 The Salk Vaccine. In the 1940s and early 1950s, the public was greatly concerned about polio. In an attempt to prevent this disease, Jonas Salk of the University of Pittsburgh developed a polio vaccine. In a test of the vaccine’s efficacy, involving nearly 2 million grade-school children, half of the children received the Salk vaccine; the other half received a placebo, in this case an injection of salt dissolved in water. Neither the children nor the doctors performing the diagnoses knew which children belonged to which group, but an evaluation center did.

Premium Essay

...Textbook Page 45 - #3, #5, #7 3. Identify the level of measurement (nominal, ordinal, interval, or ratio) used: a. The pulse rates of women listed in Data Set 1 of Appendix B Interval b. The genders of the subjects in Data Set 3 of Appendix B Nominal c. The body temperatures of subjects in Data Set 2 of Appendix B Interval d. A movie critic’s ratings of “must see, recommended…” etc. Ordinal 5. IBM Survey The computer giant IBM has 329,373 employees and 637,133 stockholders. A vice president plans to conduct a survey to study the number of shares held by individual stockholders. a. Are the numbers held by stockholders discrete or continuous? Discrete b. Identify the level of measurement for the numbers of shares held. Interval c. If the survey is conducted by telephoning 20 randomly selected stockholders in each of the 50 United States, what type of sampling is being used? Probability Sample (Different state populations, still 20 per state) d. If a sample of 1000 stockholders is obtained, and the mean number of shares is calculated for this sample, is this a statistic or a parameter? Statistic e. What is wrong with gauging stockholder views about employee benefits by mailing a questionnaire that IBM stockholders could complete and mail back? Voluntary Response has an additional stipulation of perhaps “Why” a stockholder was compelled to respond, welcoming possible consistent negative feedback. For example, only the unhappy were......

Words: 324 - Pages: 2

Free Essay

...Section 1-2 Ex. 26 Surgery vs. Splints – A study compared surgery and splinting for subjects suffering from carpal tunnel syndrome. It was found that among 73 patients treated with surgery, there was a 92% success rate. Among 83 patients treated with splints, there was a 72% success rate. Calculations using these results showed that if there really is no difference in success rates between surgery and splints, then there is about a 1 in 1000 chance of getting success rates like the one obtained in this study. a. Should we conclude that surgery is better than splints for the treatment of carpal tunnel syndrome? It would be unfair to make such a conclusion. There are pieces of data missing: age of the patients, current health conditions of the patients, and prior treatments the patients had for this condition. b. Does the result have practical significance? The study did not generate enough viable results to make it practical for any use other than to ensure that a greater investigation should be conducted to verify the differences between the two treatment methods. These results were most likely voluntary responses, making the data gained, fairly useless. c. Should surgery be the recommended treatment for carpal tunnel syndrome? No, there is no defined level of severity for each patient. Without that information a logical recommendation for treatment cannot be assigned. Section 1-3 Ex. 30 Cloning Survey – A Gallup poll of 1012 randomly surveyed adults found......

Words: 1051 - Pages: 5

Premium Essay

...1. Consider a football team for whom the numbers on the active players’ jerseys are 29, 41, 50, 58, 79,…, 10 (listed in alphabetical order of players’ names). Does it make sense to calculate the means of those numbers? Why are why not? No because it doesn’t make sense to calculate jersey numbers but stats maybe 2. The Fair Isaac Corporation (FICO) credit rating scores obtained in a simple random sample are listed below: 714 751 664 789 818 779 698 836 753 834 693 802 a. Find mean, median, mode, and midrange. 714+ 751+ 664+ 789+ 779+ 698+ 836+ 753+ 834+ 693+ 802= 9131 Mean 760.9 Median 766 Mode 0 Midrange 766 b. As of this writing, the reported mean FICO score was 678. Do these sample FICO scores appear to be consistent with the reported mean? No it was much higher 3. A student earned grades of 92, 83, 77, 84, and 82 on her five regular tests. She earned grades of 88 on the final exam and 95 on her class projects. Her combined homework grade was 77. The five regular tests count for 60% of the final grade, the final exam counts for 10%, the project counts for 15%, and homework counts for 15%. What is her weighted mean grade? Grades 92+ 83+ 77+ 84+ 82/ 5 = 83.6 Regular grades 83.6 x0.60= 50.16 Final exam 88 x 0.10 = 8.8 Class project 95 x 0.15 = 14.25 Homework 77 x 0.15 = 11.55 Her weighted mean grade is 84.71 4. Bao Xishun is the world’s tallest man with a height of 92.95 in. (or 7 ft. 8.95 in.). Men have heights with a mean of 69.6...

Words: 347 - Pages: 2

Free Essay

...MA3110: Module 6 Correlation and Regression Exercise 6.1 Linear Correlation 1 In this exercise, you will solve three questions, where you will be asked to calculate a linear correlation coefficient and determine whether there is a linear correlation between the two given variables. Solve the following problems: Listed below are baseball team statistics, consisting of the proportions of wins and the result of this difference: Difference (number of runs scored) - (number of runs allowed). The statistics are from a recent year, and the teams are NY—Yankees, Toronto, Boston, Cleveland, Texas, Houston, San Francisco, and Kansas City. Difference 163 55 –5 88 51 16 –214 Wins 0.599 0.537 0.531 0.481 0.494 0.506 0.383 o Construct a scatter plot, find the value of the linear correlation coefficient r, and find the critical values of r from Table VI, Appendix A, p. A-14, of your textbook Elementary Statistics. Use α = 0.05. o Is there sufficient evidence to conclude that there is a linear correlation between the proportion of wins and the above difference? A classic application of correlation involves the association between temperature and the number of times a cricket chirps in a minute. Listed below are the numbers of chirps in 1 minute and the corresponding temperatures in °F: Chirps in 1 Min 882 1188 1104 864 1200 1032 960 900 Temperature(°F) 69.7 93.3 84.3 76.3 88.6 82.6 71.6 79.6 o Construct a scatter plot, find the value of the linear correlation......

Words: 426 - Pages: 2

Premium Essay

...Michael J. Manning MA3110 Statistics Dr. P. A. Williams What is my meaning of Statistics? My meaning or definition of statistics is that of its base word itself. Stat. Along with other elements that would make it a definition or an opinion of sort, but I’m sure that I won’t be far from what others may say it means or what they think it means. Stat is defined as with no delay; at once. When most of us think about statistics, we think of comparisons, of two or more entities but ones balance might be more or less as well as winning and losing. There is still that scale that separates the two where one is ahead of the other. The people analyzing and drawing conclusions are getting this information have to get it out to those that follow up on whatever the subject may be fast because people want to know. It’s said that Statistics is the science of planning studies and experiments, obtaining data, and then organizing, summarizing, presenting, analyzing, interpreting, and drawing conclusions based on data according to (Pearson’s Elementary Statistics Using Microsoft Excel by, Mario F. Triola). This is the same as I said without including all of the other tools needed, or used in Statistics. Television shows are another example being on statistic radar so to speak. You have so many television shows that are out right......

Words: 499 - Pages: 2

Premium Essay

...MA3110: Week 3 Measures of Center Exercise 3.1 Calculating Measures of Center Solve the following and include a show of steps for all calculations. 1. Consider a football team for whom the numbers on the active players’ jerseys are 29, 41, 50, 58, 79,…, 10 (listed in alphabetical order of the players’ names). Does it make sense to calculate the mean of those numbers? Why or why not? 2. The Fair Isaac Corporation (FICO) credit rating scores obtained in a simple random sample are listed below: 714 751 664 789 818 779 698 836 753 834 693 802 a. b. Find mean, median, mode, and midrange. As of this writing, the reported mean FICO score was 678. Do these sample FICO scores appear to be consistent with the reported mean? 3. A student earned grades of 92, 83, 77, 84, and 82 on her five regular tests. She earned grades of 88 on the final exam and 95 on her class projects. Her combined homework grade was 77. The five regular tests count for 60% of the final grade, the final exam counts for 10%, the project counts for 15%, and homework counts for 15%. What is her weighted mean grade? 4. Bao Xishun is the world’s tallest man with a height of 92.95 in. (or 7 ft. 8.95 in.). Men have heights with a mean of 69.6 in. and a standard deviation of 2.8 in. a. b. Convert Bao’s height to a z-score. Does Bao’s height meet the criterion of being unusual by corresponding to a z-score that does not fall between -2 and 2? 1...

Words: 275 - Pages: 2

Premium Essay

...4/27/2014 MA3110 Statistics Otis Jackson Unit 4 problem set 1: Normal Probability Distributions Page.285 Ex 6,8,10,12 6. x = 80, z=80-10015 = -1.33 z= 0.0918 1-0.0918 = 0.9082 8. x = 110, z=110-10015 = 0.67 z= 0.7486 z= 75-10015 = -1.67 z= 0.0475 0.7486-0.0475= 0.7011 (shaded area) 10. z= 0.84 (shaded) z= -0.84 x= 100+(-0.84∙15) = 87 (rounded) 12. . z= 2.33 x= 100+(2.33∙15) = 135 (rounded) Page 288 Ex 34 34.Appendix B Data Set: Duration of Shuttle Flights a. Find the mean and standard deviation, and verify that the data have a distribution that is roughly normal. Mean= 25317115 = 220.15 Standard Deviation=115253172-(25317)2115(115-1) = 86 (rounded) The normal distribution is 115 b. Treat the statistics from part (a) as if they are population parameters and assume a normal distribution to find the values of the quartiles 1,2 and 3. Mean= 220.15 Standard Deviation= 86 Q1 = 220.5 + (-0.67 ∙ 86)= 162.53 Q2= 220.5 + (0.00 ∙ 86) = 220.5 Q3=220.5 + (0.67 ∙ 86) = 277.77 Page.300 Ex 20 Quality Control: Sampling Distribution of Proportion after constructing a new manufacturing machine. 5 prototype integrated circuit chips are produced and it is found that 2 are defective (D) and 3 are acceptable (A). Assume that two if the chips are randomly selected with replacement from this population a. After identifying the 25 different possible samples, find the proportion of defects in each of them, then use a table to......

Words: 675 - Pages: 3

Premium Essay

...ITT Technical Institute IS3340 Windows Security Onsite Course SYLLABUS Credit hours: 4.5 Contact/Instructional hours: 60 (30 Theory Hours, 30 Lab Hours) Prerequisite(s) and/or Corequisite(s): Prerequisite: NT2580 Introduction to Information Security or equivalent Course Description: This course examines security implementations for a variety of Windows platforms and applications. Areas of study include analysis of the security architecture of Windows systems. Students will identify and examine security risks and apply tools and methods to address security issues in the Windows environment. Windows Security Syllabus Where Does This Course Belong? This course is required for the Bachelor of Science in Information Systems Security program. This program covers the following core areas: Foundational Courses Technical Courses BSISS Project The following diagram demonstrates how this course fits in the program: IS4799 NT2799 IS4670 ISC Capstone Project Capstone ProjectCybercrime Forensics NSA NT2580 NT2670 Introduction to Information Security IS4680 IS4560 NT2580 NT2670 Email and Web Services Hacking and Introduction to Security Auditing for Compliance Countermeasures Information Security Email and Web Services NT1230 NT1330 Client-Server Client-Server Networking I Networking II IS3230 IS3350 NT1230 NT1330 Issues Client-Server Client-Server SecurityContext in Legal Access Security Networking I Networking II ......

Words: 2305 - Pages: 10