A random sample was taken from the normal IQ population, which has μ = 100 and σ = 15.

Question

ALL INFORMATION IS GIVEN:
We gave a random sample of 25 undergrad students (n = 25) a new study pattern to see if it increases their IQ score. The samples mean IQ score is 112. The alpha used is (α) .05.
Does the new study pattern increase the undergraduates IQ score? Follow all the steps to calculate and answer the question above!!!
Step 1 - State hypotheses:
Step 2 - Find the critical regions and draw the distribution:

Step 3 – Compute z statistic (also plot distribution):

Step 4 – Make a decision: