In performing a hypothesis test where the null hypothesis is that the population mean is 6.9 against the alternative hypothesis that the population mean is not equal to 6.9, a random sample of 16 items is selected.The sample mean is 7.1 and the sample standard deviation is 2.4.It can be assumed that the population is normally distributed.The level of significance is selected as 0.05.The table "t" value for this problem is ___.
A)1.753
B)2.947
C)2.120
D)2.131
E)2.311

Question

Quizplus · Accepted Answer

Since the sample size is less than 30 and the population standard deviation is unknown, we use a t-test. The degrees of freedom for this test are 16-1=15. In a two-tailed test with a level of significance of 0.05, the table "t" value is 2.131.

In Performing a Hypothesis Test Where the Null Hypothesis Is