A researcher selects a sample from a population with a mean

A researcher selects a sample from a population with a mean of = 40 and administers a treatment to the individuals in the sample. Which of the following is the correct statement of the null hypothesis for a two-tailed t-test for a single sample?

a. u=40

b. u<40

c. M=40

d. M<40

Solution

a. u=40, For Two tailed we always use the equality notation in Null Hypothesis