Based on interviews with 85 SARS patients, researchers found that the mean incub

ID: 3392351 • Letter: B

Question

Based on interviews with 85 SARS patients, researchers found that the mean incubation period was 5.5 days, with a standard deviation of 15.4 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 days. (Round to two decimal places as needed.) The upper bound is days. (Round to two decimal places as needed.) Interpret the interval. Choose the correct answer below. There is 95% confidence that the mean incubation period lies between the lower and upper bounds of the interval. There is 95% confidence that the mean incubation period is less than the lower bound of the interval. There is a 95% probability that the mean incubation period lies between the lower and upper bounds of the interval. There is 95% confidence that the mean incubation period is greater than the upper bound of the interval.

Explanation / Answer

Confidence Interval Estimate for the Mean

Data

Sample Standard Deviation

14.9

Sample Mean

4.8

Sample Size

Confidence Level

95%

Intermediate Calculations

Standard Error of the Mean

1.5883

Degrees of Freedom

t Value

1.9876

Interval Half Width

3.1570

Confidence Interval

Interval Lower Limit

1.64

Interval Upper Limit

7.96

Correct answer B

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