# The jmp output below gives selected summary measures

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Chapter 9 / Exercise 8
Introduction to Probability and Statistics
Beaver/Mendenhall
Expert Verified
19. The JMP output below gives selected summary measures for the GPAs of 19 randomly selected STAT 2300 students. Based on this output, which of the following represents a confidence interval for the mean GPA of all STAT 2300 students correctly rounded to two decimal places? Distributions GPA 2 2.5 3 3.5 4 Quantiles 100.0% 99.5% 97.5% 90.0% 75.0% 50.0% 25.0% 10.0% 2.5% 0.5% 0.0% maximum quartile median quartile minimum 4 4 4 3.92 3.47 3.12 2.66 2.12 1.98 1.98 1.98 Summary Statistics Mean Std Dev Std Err Mean Upper 95% Mean Lower 95% Mean N 3.0778947 0.6037069 0.1384999 3.3688721 2.7869173 19 (A) (2.66, 3.47) (B) (2.94, 3.22) (C) (2.79, 3.37) (D) (2.78, 3.36)
20. A pharmaceutical company's allergy medication is known to provide relief to 75% of the people who use it. The company wants to see if a new, improved version of the medication works even better. In a test of the hypotheses H 0 : p = .75 versus H 1 : p > .75, the p -value is .32. Which of the following gives the best interpretation of this p -value?
21. If the sample size used to calculate a confidence interval is quadrupled, and everything else remains the same, what happens to the margin of error?
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Chapter 9 / Exercise 8
Introduction to Probability and Statistics
Beaver/Mendenhall
Expert Verified
22. A poll found that of 1,000 randomly selected registered voters, 513 would vote for Hilary Clinton for president. The following hypotheses test whether a majority of all registered voters would vote for Clinton if she were on the ballot in the general presidential election. H 0 : = .50 H 1 : > .50 Which of the following best describes a Type I error in this context?
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