In an application to estimate the mean number of miles that downtown employees commute to work roundtrip each day,the following information is given: n = 20 = 4.33
S = 3.50
If the desired confidence level is 95 percent,the appropriate critical value is:
A)z = 1.96
B)t = 2.093
C)t = 2.086
D).7826

Question

In an application to estimate the mean number of miles that downtown employees commute to work roundtrip each day,the following information is given: n = 20  = 4.33
S = 3.50
If the desired confidence level is 95 percent,the appropriate critical value is:
A)z = 1.96 
B)t = 2.093 
C)t = 2.086 
D).7826

Quizplus · Accepted Answer

Since the sample size is less than 30 and the population standard deviation is unknown, we use a t-distribution. At a 95% confidence level and 19 degrees of freedom (n-1), the appropriate critical value is 2.093. Therefore, the best choice is B.

In an Application to Estimate the Mean Number of Miles