In an application to estimate the mean number of miles that downtown employees commute to work roundtrip each day,the following information is given: 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:  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 not given, we cannot use the z-test and have to use the t-test instead. For a 95% confidence level with likely degrees of freedom, the appropriate critical value is t=2.093. Therefore, the answer is B, t=2.093.

In an Application to Estimate the Mean Number of Miles