1. The owner of a large company, wanted to compare the mean daily output of a particular item for four plants. For each plant, a random sample of 4 days gave the data listed in the following table. Do sample data indicate a difference in the population means for the plants? Solve using the steps in hypothesis testing, using 5% level of significance.

A B C D

28 17 17 18

21 16 11 13

23 14 12 10

16 24 12 14

a. Formulate the hypotheses

b. Set the level of significance

c. Determine the test statistics

d. Determine the Critical /Tabular value using the degree of freedom.

e. Compute the statistical treatment

f. Make a decision