A survey of full professors (highest ranking) in History found that the average income is $74,914. Because that survey is now over 8 years old, an institutional researcher wants to test this figure by taking a random sample of 112 History professors with full professorship status. The researcher finds a sample mean of $81,342. The population standard deviation is known to be $15,121.
-What is the rejection point for testing these hypotheses at α = .05?
A)1.28
B)1.645
C)1.96
D)2.33
E)2.575

Question

Quizplus · Accepted Answer

The rejection point for testing hypotheses at α = .05 is 1.96 for a two-tailed test. This means that if our test statistic falls above or below this value, we would reject the null hypothesis. Therefore, choice C is the best answer.

A Survey of Full Professors (Highest Ranking) in History Found