A psychologist has designed a new intelligence test. Historically, time to complete the old test was an average of 120 minutes. With the altered format of the test, the psychologist claims that the time to complete the test is no longer 120 minutes. A sample of 50 new test taking times yielded an average time of 118 minutes. The population standard deviation is known to be 5 minutes
-How much evidence do we have to reject the null hypothesis?
A)No evidence
B)Some evidence
C)Strong evidence
D)Very Strong evidence
E)Extremely Strong evidence

Question

Quizplus · Accepted Answer

The level of evidence needed to reject the null hypothesis is typically set at a significance level of 0.05 or 0.01. If the obtained p-value is less than the significance level, it indicates that there is very strong evidence against the null hypothesis and we can reject it. Therefore, the best choice is D, which represents very strong evidence.

A Psychologist Has Designed a New Intelligence Test