A researcher would like to determine whether a new drug has an effect on IQ. A sample of n=100 participants is obtained, and each person is given a standard dose of the medication one hour before...

A researcher would like to determine whether a new drug has an effect on IQ. A sample of n=100 participants is obtained, and each person is given a standard dose of the medication one hour before being given an IQ test. For the general population, scores on the IQ test are normally distributed with
μ=100 and σ=15. The individuals in the sample who took the drug had an average score of M=103.

a. Use a two-tailed test with alpah=.05. Conduct the four steps for hypothesis testing and label each step 1-4

b. Calculate Cohen's d

c. Is the data sufficient to conclude that there is a significant difference?