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A Sociologist Develops a Test to Measure Attitudes About Public

Question 116
Multiple Choice

A sociologist develops a test to measure attitudes about public transportation.She wishes to compute a 95% confidence interval for the mean score on this test.It is believed that the standard deviation for these test scores will be 21.How many people should be given the test in order to achieve a margin of error of 10? A)19 B)20 C)16 D)18 E)17

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Q 117
A sociologist develops a test to measure attitudes about public transportation.She wishes to compute a 90% confidence interval for the mean score on this test.It is believed that the standard deviation for these test scores will be 21.How many people should be given the test in order to achieve a margin of error of 10? A)11 B)14 C)12 D)15 E)13
Q 118
You want to estimate the average gas price in your city for a litre of regular unleaded gasoline with 95% confidence.You believe that the standard deviation of prices is $0.05.If you wish to achieve a margin of error no larger than $0.02,how many gas stations should you sample? A)25 B)28 C)27 D)24 E)26
Q 119
You want to estimate the average gas price in your city for a litre of regular unleaded gasoline with 90% confidence.You believe that the standard deviation of prices is $0.04.If you wish to achieve a margin of error no larger than $0.02,how many gas stations should you sample? A)13 B)11 C)12 D)14 E)10
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