Case Consider the following hypothesis tests: H0: 20 Ha: <20 The research sample was 50 and the sample mean was 19.4. The

Case

Consider the following hypothesis tests:
H0: µ ≥ 20
Ha: µ <20
The research sample was 50 and the sample mean was 19.4. The standard deviation (standard deviation) is 2.

Question:
a. Calculate the statistical test value.
b. What is the p-value?
c. Using a = 0.05, what is your conclusion?
d. What if the rejection rule uses critical values? What\'s your conclusion?