section_problems_8

# section_problems_8 - population parameter= 0.8 a What are...

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Section Problems #8 #1) You are interested in attitudes toward drinking among the 340 members of a sorority. You choose 20 members at random to interview. One question is “Have you had five or more drinks at one time during the last week?” Suppose that in fact 30% of the 340 members would say “Yes.” Here, can you safely use the B(20, 0.3) distribution for the count X in your sample who say “Yes”? #2) You are interested in attitudes toward drinking among the 800 members of a sorority. You choose 21 members at random to interview. One question is “Have you had five or more drinks at one time during the last week?” Suppose that in fact 8% of the 800 members would say “Yes.” Here, can you safely use the normal approximation for the sample proportion when an SRS of 21 individuals from the population of 800 is drawn? #3) A SRS of 1000 adults asks if they agree with the statement “I support Senator Clinton.” Suppose that 80% of all US adults would agree if asked this question so the
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Unformatted text preview: population parameter= 0.8. a) What are the mean and standard deviation of the sample proportion p ˆ ? Round your answers to five decimal places if necessary . b) What is the probability that the survey result differs from the truth about the population by more than 2 percentage points? Use your final answers from part a. Use actual values from Table A. Round your final answer to four decimal places. from book: 5.22 (page 333) Round the mean and standard deviation of the sample proportion p ˆ to five decimal places if necessary. Use those numbers to solve for the probability. Round your final answer for the probability to four decimal places. 5.28 (page 334) For all parts of this problem, round the mean and standard deviation of the count X to five decimal places if necessary. Use those numbers to solve for the probability. Round your final answer for the probability to four decimal places....
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