According to an early CDC study of 21 patients infected with the swin flu, the average
incubation period was 7 days with a sample standard deviation of 4.5 days. We will assume that
the incubation times are normall distributed.
Find a 95% confidence interval for the true average incubation period. Use Minitab for your
computations.
Solution
Given n=21, xbar=7, s=4.5
a=0.05, |t(0.025,df=n-1=20)|=2.09 (check student t table)
So 95% CI is
xbar ± t*s/n
--> 7 ± 2.09*4.5/sqrt(21)
--> ( 4.947661, 9.05234).
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According to an early CDC study of 21 patients infected with the swi.pdf
1. According to an early CDC study of 21 patients infected with the swin flu, the average
incubation period was 7 days with a sample standard deviation of 4.5 days. We will assume that
the incubation times are normall distributed.
Find a 95% confidence interval for the true average incubation period. Use Minitab for your
computations.
Solution
Given n=21, xbar=7, s=4.5
a=0.05, |t(0.025,df=n-1=20)|=2.09 (check student t table)
So 95% CI is
xbar ± t*s/n
--> 7 ± 2.09*4.5/sqrt(21)
--> ( 4.947661, 9.05234)
