STAT 362 R Language Worksheet

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STAT 362

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Stat 362: Chapter 5 Worksheet Name: UIN: Show all of your work / code. No credit will be given if there is no work / code. 1. A random sample of 64 bags of white cheddar popcorn is obtained, and their weights, in ounces, is recorded. We want to test the hypothesis that the average weight of the bags are less than 5.3 ounces, at the 0.05 level of significance. Use a 1-sample t-test. Note: You can obtain the dataset in the file: “Popcorn.csv”. There is a header. • Hypotheses: • Code: • Test-Statistic Value: • P-Value: • Decision (Reject or Not): • Conclusion: 2. Some researchers claim that susceptibility to hypnosis can be acquired or improved through training. To investigate this claim six subjects were rated on a scale of 1 to 20 according to their initial susceptibility to hypnosis and then given 4 weeks of training. Each subject was rated again after the training period. In the ratings below, higher numbers represent greater susceptibility to hypnosis. We are interested in whether the subjects are more susceptible after training. Use a 0.10 significance level. Before 10 16 7 4 7 2 Subject 1 2 3 4 5 6 After 18 19 11 3 5 3 Using the Sign Test, test the hypothesis that the median values before are smaller than the differences after. Define Zi = bef ore − af ter. Note: You can obtain this dataset in the file “Hypnosis.csv”. There is a header. Note: You will need to install the package: “BSDA”. • Hypotheses: • Code: • Median of the differences: • P-Value: • Decision (Reject or Not): • Conclusion: 2
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Stat 362: Chapter 5 Worksheet
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