A researcher tests whether there is any difference between how fast people work in the morning versus how fast they work in the evening. What is the NULL hypothesis?
A)People who work in the morning work faster.
B)People who work at night work faster.
C)There is some difference, but which is faster is not predicted.
D)There is no difference in the speed at which people work.

Question

Quizplus · Accepted Answer

The null hypothesis is always that there is no significant difference between the groups being compared. In this case, the researcher is testing whether there is a difference between how fast people work in the morning versus in the evening. The null hypothesis therefore would be that there is no difference in the speed at which people work, regardless of whether it is morning or evening. Option D best represents this null hypothesis.

A Researcher Tests Whether There Is Any Difference Between How