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A Laboratory Wishes to Compute a 95% Confidence Interval for the Mean

Question 114
Multiple Choice

A laboratory wishes to compute a 95% confidence interval for the mean amount of cholesterol,in milligrams,in chicken eggs.They believe the population standard deviation to be 15 milligrams.How many eggs should they use if they want a margin of error of 10 milligrams? A)9 B)8 C)12 D)10 E)11

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Q 115
A laboratory wishes to compute a 95% confidence interval for the mean amount of cholesterol,in milligrams,in chicken eggs.They believe the population standard deviation to be 40 milligrams.How many eggs should they use if they want a margin of error of 20 milligrams? A)15 B)17 C)16 D)18 E)19
Q 116
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
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
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