Responses to a CNN poll to a survey questionnaire are broken

Responses to a CNN poll to a survey questionnaire are broken down according to employment status and the sample results are shown below.At the 0.10 significance level, test the claim that the response to the questionnaire and employment status is independent.

Yes

No

Undecided

Employed

30

15

5

Unemployed

20

25

10

Solution

The test hypothesis:

Ho: the response to the questionnaire and employment status is independent (i.e. null hypothesis)

Ha: the response to the questionnaire and employment status is not independent (i.e. alternative hypothesis)