Based on interviews with 85 SARS patients researchers found

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.

Solution

Confidence Interval Estimate for the Mean

Data

Sample Standard Deviation

14.9

Sample Mean

4.8

Sample Size

88

Confidence Level

95%

Intermediate Calculations

Standard Error of the Mean

1.5883

Degrees of Freedom

87

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.

Confidence Interval Estimate for the Mean
Data
Sample Standard Deviation	14.9
Sample Mean	4.8
Sample Size	88
Confidence Level	95%
Intermediate Calculations
Standard Error of the Mean	1.5883
Degrees of Freedom	87
t Value	1.9876
Interval Half Width	3.1570
Confidence Interval
Interval Lower Limit	1.64
Interval Upper Limit	7.96