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#1
07-15-2012
 USMLE Forums Master Steps History: 1+CK+CS Posts: 1,867 Threads: 149 Thanked 2,107 Times in 1,049 Posts Reputation: 2127
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%

#2
07-15-2012
 USMLE Forums Master Steps History: 1+CK+CS Posts: 646 Threads: 52 Thanked 762 Times in 256 Posts Reputation: 773

The 95% confidence interval will be narrower than the 99%.
#3
07-15-2012
 USMLE Forums Veteran Steps History: 1+CK+CS Posts: 289 Threads: 7 Thanked 129 Times in 102 Posts Reputation: 139
A

Would go with A

#4
07-16-2012
 USMLE Forums Master Steps History: --- Posts: 1,365 Threads: 648 Thanked 591 Times in 355 Posts Reputation: 601

Quote:
 Originally Posted by Anders Would go with A
#5
07-16-2012
 USMLE Forums Addict Steps History: 1+CK+CS Posts: 189 Threads: 20 Thanked 506 Times in 99 Posts Reputation: 516

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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 Tags Biostatistics-Epidemiology, Step-2-Questions

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