Question 14
Please answer the following set of questions, based onthe information provided below.
A service company is curious to know whether customer age iscrucial in deciding to subscribe. The company has collected arandom sample of 1000 people, and asked everyone whether he or shewould subscribe to the service. The company knows which age groupthe person falls into: under 18 years of age, 18 - 29 years of age,30-45 years of age and 46 years or older. The company decides touse a chi-square test of independence at 0.05 level of significanceto answer its questions. Below are the sample’s data:
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| Under 18 | 18-29 | 30-45 | 46 or older | Total |
Yes | 160 | 220 | 150 | 120 | 650 |
No | 70 | 110 | 90 | 80 | 350 |
Total | 230 | 330 | 240 | 200 | 1000 |
What is the degrees of freedom (df) for this test?
