deviation. The results are defined in the following Excel image. 2. My next task is to construct a 95% confidence interval for the ounces in the bottles. The population mean (µ) is the parameter that I will be using for this equation. From the random sample, the value of µ is x=14.92 The confidence level of the based on this sample will be constructed to capture the µ with 95% confidence. The sample size is n=30 and the population standard deviation is 0.55. According to the central limit
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Lab 61: Confidence Intervals on Proportions In this lab you're going to use the simulation at http://statweb.calpoly.edu/chance/applets/Reeses/ReesesPieces.html to take virtual samples of Reese's pieces (sorry no real chocolate) Open up the simulator and set π = .3. This is really p, but on my screen it comes out as π, set Sample Size, n = 30 . This means we are setting the proportion of orange Reese's pieces as .3 When you click on "Select Sample" the computer will pull 30 Reese's pieces
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NORTHEASTERN UNIVERSITY - GRADUATE SCHOOL OF BUSINESS ADMINISTRATION MGSC 6200: DATA ANALYSIS Spring, 2015 Instructor Information Name: Dr. Nizar Zaarour E-mail address: n.zaarour@neu.edu Office: 214 Hayden Hall Office hours: Monday and Wednesday: 12 – 2 PM and by appointment. Course Overview The objectives of this course are: (1) To provide you with an understanding of statistical methods and techniques and their usefulness in the decision-making process, (2) To expose you to the methods of descriptive
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below: 0 260 356 403 536 0 268 369 428 536 268 396 469 536 162 338 403 536 536 130 (a) Construct a 95 percent confidence interval for the true mean. x-bar = 346.5 s = 170.378 t-critical value for 95% CI with df=19 = 2.093 E = 2.093*170.378/sqrt (20) = 2.0931.96*38.0976=79.74 95% CI : (346.5-79.74,346.5+79.74) (b) Why might normality be an issue here? The Confidence Interval is a statement about the whole population. The random sample is probably not representative of the whole population
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Hypothesis Testing: One Population Hypothesis testing is used to make decisions about a population based on the analysis of sample statistics. There are always two hypothesis statements which are mutually exclusive and complementary statements concerning the value of the population parameter of interest: Null Hypothesis (H0): An assumption regarding a population parameter of interest. This hypothesis always includes the equal sign as the null hypothesis is assumed to be true unless
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to 2 decimal places) Confidence level the interval is 68.26% 3. Let X be the value of the population. a) b) c) d) x ± Z 0.2 σ x x ± Z 0.1 σ x x ± Z 0.05 σ x x ± Z 0.02 σ x = = = = x ± 0.84σ x x ± 1.28σ x x ± 1.64σ x x ± 2.05σ x 4. Let X be the waiting time of the customer. a) b) c) σ = 5/2 = 2.5, x = 25 x ± Z0.025 σ = 25 ± 1.96 (2.5) = (20.10, 29.90) minutes σ = 5/3 = 1.6667, x = 15 x ± Z0.025 σ = 15 ± 1.96 (1.6667) = (11.73, 18.27) minutes Confidence interval is used to estimate a
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employees willing to participate. As well knowing what sampling method and frame are needed to determine the sampling size. To determine the sampling there are two key items needed are confidence interval and confidence level. The confidence level simply is how accurate can the information be. The confidence interval, margin of error, is finding the amount of maximum amount of error within the sampling group. For this sampling group has been found the size will be determined by the employees which
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The Role Of Research and Statistics In Psychology Statistical Reasoning in Psychology Research and Statistics in Psychology Research and Statistics play an important role in psychology. Researchers in the field of psychology study what people will do or how they will react in any situation. Since not everyone reacts the same to a certain situation, statistics is used to see if a certain action happens often enough to come to an idea about cause and effect. It used to be believed
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hospital, previous research and history of each manufacturer, and the history of table use within the facility. Using the survey a confidence interval for each manufacturer’s table can be obtained. Using the confidence interval will in turn help calculate the confidence level of the product in the eyes of the staff. Not only can the staff survey help lead to a high confidence level but
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Karakkunnel, Valavoor.P.O Pala, Kottayam (D) Pin: 686635 E-mail id -
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