Exam 2 Answers

Exam 2 Answers - Stat 200 Exam 2 Fall Semester 07 (Sections...

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Unformatted text preview: Stat 200 Exam 2 Fall Semester 07 (Sections 9-12) Form A (37 questions/each worth 3 points - so points of extra credit as possible) Name: __________________________ Student Number (last four digits):____________ Fill-in both: your complete 9 digit- Student Number & Test Form on your scantron Put both your name and student number (last 4 digits) on the exam Hand-in both exam and Scranton. Show ID Must have a different colored exam than the person on either side of you. You may not use you a textbook, notes, and calculator, etc. while taking this exam You may not talk to other students during the exam Use with Questions 1-3: A university report states that about 45% of all students have driven while under the influence of alcohol. Other, however, think the correct percent is actually less than 45%.To resolve the issue, a random sample of 400 students is obtained and it is found that 156 or 39% admit that they have driven under the influence of alcohol. Here is the correct Minitab output for this data analysis. X N Sample p Z-Value P-Value 156 400 0.390000 -2.41 0.008 Question 1: What are the appropriate null and alternative hypotheses when conducting a hypothesis test to challenge the results stated in the university report? A. H : = .45 vs. H a : < .45 B. H : = .45 vs. H a : < .45 C. H : p = .45 vs. H a : p < .45 D. H : p = .45 vs. H a : p < .45 Question 2 : Be careful! Which of the following is the correct interpretation of the p-value that is found for this study? The likelihood of getting the Z test statistic of -2.41 or _____________ A. any value larger, if in fact the null hypothesis is true, is .008 B. any value larger, if in fact the alternative hypothesis is true, is .008 C. any value smaller, if in fact the null hypothesis is true, is .008 D. any value smaller, if in fact the alternative hypothesis is true, is .008. Question 3: What statistical conclusion can be made? A. Can claim that the population proportion that has driven under the influence of alcohol is less than .45. B. Can claim that the population proportion that has driven under the influence of alcohol is equal to .45. C. Can claim that the population proportion that has driven under the influence of alcohol is greater than .45.--------------------------------------------------------------------------------------------------------------------------------- Question 4: Confidence intervals suggest possible values for the _________ A. sample estimate B. test statistic C. margin of error D. population parameter Question 5: A 95% confidence interval for , the population mean number of hours/week spent exercising is around (2.5 to 3.5) hrs. Which of the following statements is true ? A hypothesis test of: _____ A. H : =1.0 versus Ha: 1.0 would not be statistically significant....
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This note was uploaded on 03/18/2008 for the course STAT 200 taught by Professor Barroso,joaor during the Fall '08 term at Penn State.

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Exam 2 Answers - Stat 200 Exam 2 Fall Semester 07 (Sections...

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