You are interested in determining if the average amount of time (in hours)that students spend on the Internet per day is greater than 2 hours.The data below are from a random sample of 11 students. If we remove the second observation (value = 100),we could test the hypothesis using a ____ .
A)z statistic
B)t statistic

Question

You are interested in determining if the average amount of time (in hours)that students spend on the Internet per day is greater than 2 hours.The data below are from a random sample of 11 students.  If we remove the second observation (value = 100),we could test the hypothesis using a ____ .
A)z statistic 
B)t statistic

Quizplus · Accepted Answer

Since our sample size is small (n=10) and the population standard deviation is unknown, the best choice is to use a t statistic for hypothesis testing. Removing an outlier in the data (the value of 100) may be appropriate to ensure that the sample is representative of the population, but it does not affect the choice of test statistic.

You Are Interested in Determining If the Average Amount of Time