Costco claims they have more than 100 customers enter their store each hour. They sampled the number of customers that entered the store in 24hrs. If the level of significance is .10.

Step 4: Formulate the decision rule.

a. reject H0 if t > 1.3118

b reject H0 if t < 1.318

c. reject H0 if z > 1.28

d. reject H0 if 1.28 > z > 1.28