Question

Based on interviews with 87

SARS patients, researchers found that the mean incubation period was 5.5

days, with a standard deviation of 15.6

days. Based on this information, construct a 95% confidence interval for the mean incubation period of the SARS virus. Interpret the interval.

The lower bound is

nothing

days. (Round to two decimal places as needed.) The upper bound is

nothing

days. (Round to two decimal places as needed.)

Interpret the interval. Choose the correct answer below.

A.

There is 95% confidence that the mean incubation period lies between the lower and upper bounds of the interval.

B.

There is a 95% probability that the mean incubation period lies between the lower and upper bounds of the interval.

C.

There is 95% confidence that the mean incubation period is less than the lower bound of the interval.

D.

There is 95% confidence that the mean incubation period is greater than the upper bound of the interval.

Answer #1

Refer t-table or use excel function
"* =T.INV.2T(0.05,86)*" to find the value of
t.

**There is 95% confidence that the mean incubation period
lies between the lower and upper bounds of the
interval.**

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