Solution 1 Data Analysis Assignment 4 Make sure you do the following Points will be taken off if you do not For an example of formatting see the sample
Solution Data Analysis Assignment Make sure you do the following Points will be taken off if you do not For an
Solution Data Analysis Assignment Make sure you do the following Points will be taken off if
sure you do the following Points will be taken off if you do not For an example of formatting see the sample
Solution Data Analysis Assignment Make sure you do the following Points will be
taken off if you do not For an example of formatting see the sample
Solution Data Analysis Assignment Make sure you do the following
Solution Data Analysis Assignment Make
(Solution) 1 Data Analysis Assignment 4 Make sure you do the following. Points will be taken off if you do not. (For an example of formatting, see the sample...

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Problem 3:a)Start in StatCrunch by clicking Applets à Confidence intervals à for a proportion.  Choose any value for the population proportion between 0.01 and 0.99.  Enter this value in the box following p:under Population: / Proportion with characteristic Set the Initial confidence level: to any value between 0.90 and 0.99. Choose a sample size n that is at least large enough so that np ? 10 and n(1 – p) ? 10 where p is the chosen value for the population proportion.  Enter this in the box under Initial sample size: Click Compute!  Then, once your first 100 intervals have been constructed, click the 1000 intervals button near the top of the graph.  You will now have 1100 total intervals.  Copy and paste your graph of many confidence intervals.  (Your graph will represent intervals 1001 to 1100.)  Discuss the percentage capturing p listed under Prop. contained  in relation to the correct confidence interval interpretation discussed in class.1 Data Analysis Assignment 4 Make sure you do the following. Points will be taken off if you do not. (For an example of formatting, see the sample solutions document posted in Blackboard.) 1.Type your name on your paper. 2.Under your name, put STAT 250 with your correct section number (e.g. STAT 250-xxx). 3.Type Data Analysis Assignment 4 centered on Page 1. 4.Number your pages across your entire solutions document. 5.Number and letter the answers to each problem and each part of each problem accordingly. Keep the problems (and parts of each problem) in order. 6.Use complete and coherent sentences to answer the explanation questions. Generate all requested graphs using StatCrunch. Place a copy of any requested graph in your solutions document. 7.Title and label all of your graphs “correctly” (as demonstrated in lecture notes). 8.Unless explicitly stated in the problem, you DO NOT need to include ALL StatCrunch output. You just need to include the part of the output that answers the question (i.e., the specifically requested statistics and/or graphs). 9. Upload your solutions document onto Blackboard as a Word document. 10. Please note that there is no specific data files posted on our group in StatCrunch to use to answer the following problems. However, StatCrunch will be used to answer these problems. Problem 1: Is Starbucks coffee overpriced? (25 Points) A 2010 article reported that 93% of Americans feel Starbucks coffee is overpriced. Consider the population of all Americans. a) A random sample of n = 100 couples will be selected from this population and ˆ p , the proportion of Americans who believe Starbucks is overpriced will be computed. What are the mean and standard error of the sampling distribution of the sample proportion ˆ p ? b) Is it reasonable to assume that the sampling distribution of the sample proportion ˆ p is approximately Normal for random samples of size n = 100? Explain. c) Suppose that the sample size is n = 200 rather than n = 100 as in Part b. Does the change in sample size change the mean and standard error of the sampling distribution of the sample proportion ˆ p ? If so, what are the new values for the mean and standard error? If not, explain why not. d) Is it reasonable to assume that the sampling distribution of the sample proportion ˆ p is approximately Normal for random samples of size n = 200? Explain.

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