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Old 07-15-2012
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Stats 95% confidence interval

A random sample of 300 diastolic blood pressure measurements are taken. Suppose a 99% confidence interval for the population mean diastolic blood pressure is 68 to 73 mm Hg. If a 95% confidence interval is also calculated, then
(a) The 95% confidence interval will be wider than the 99%.
(b) The 95% confidence interval will be narrower than the 99%.
(c) 95% and 99% confidence interval will be the same.
(d) One cannot make a general statement about whether the 95% confidence interval would be narrower, wider or the same as the 99%
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Old 07-15-2012
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The 95% confidence interval will be narrower than the 99%.
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Default A

Would go with A
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Old 07-16-2012
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Quote:
Originally Posted by Anders View Post
Would go with A
Should be. A. What's answer
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A random sample of 300 diastolic blood pressure measurements are taken. Suppose a 99% confidence interval for the population mean diastolic blood pressure is 68 to 73 mm Hg. If a 95% confidence interval is also calculated, then
(a) The 95% confidence interval will be wider than the 99%.
(b) The 95% confidence interval will be narrower than the 99%.
(c) 95% and 99% confidence interval will be the same.
(d) One cannot make a general statement about whether the 95% confidence interval would be narrower, wider or the same as the 99%

At 99 % Ci z = 2.5 while at 95 % it equals to 2
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