Question

Consider the following contingency table that records the results obtained for four samples of fixed sizes selected from four populations.

	Sample Selected From
	Population 1	Population 2	Population 3	Population 4
Row 1	38	75	90	79
Row 2	16	56	82	123
Row 3	45	49	78	78

a. Write the null and alternative hypotheses for a test of homogeneity for this table.

H0: The proportion in each row is

the same/not the same

for all four populations.

H1: The proportion in each row is

not the same/the same

for all four populations.

b. Calculate the expected frequencies for all cells assuming that the null hypothesis is true.

Round your answers to three decimal places, where required.

	Population 1	Population 2	Population 3	Population 4	Total
Row 1
Row 2
Row 3
Total

c. For α=0.025, find the critical value of χ2. Specify the rejection and nonrejection regions on the chi-square distribution curve.

Enter the exact answer from the chi-square distribution table.

χ2=

The rejection region is

on the right/on the left

of the critical value of χ2.

The nonrejection region is

on the right/on the left

of the critical value of χ2.

d. Find the value of the test statistic χ2.

Round your answer to three decimal places.

The value of the test statistic χ2 is .

e. Using α=0.025, would you reject the null hypothesis?

No./Yes.

Answer 1