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 decision rule for this problem is to reject the null hypothesis if the observed "t" value is ___.
A)less than -2.131 or greater than 2.131
B)less than -1.761 or greater than 1.761
C)less than -1.753 or greater than 1.753
D)less than -2.120 or greater than 2.120
E)less than -3.120 or greater than 3.120

Question

Quizplus · Accepted Answer

The degrees of freedom for the t-test is 15 (n-1 = 16-1). For a two-tailed test at a 0.05 significance level, the critical t-values are approximately -2.131 and 2.131.

In Performing a Hypothesis Test Where the Null Hypothesis Is