This Question: 1 pt 15 of 21 (21 complete) This Test: 22 pts possible Tammie won

Question

This Question: 1 pt 15 of 21 (21 complete) This Test: 22 pts possible Tammie wondered how her friends felt about their cell phone service. She randomly selected 10 of her friends who used company A and another 10 of her friends who used company B and asked if they felt their service was excellent, good, fair, or poor. Why should Tammie not use the chi-square test? Choose the correct answer below. A. ? B. ° C. 0 D. A two-sample t-test should be used instead. Even though she randomly selected friends to participate, her friends aren't representative of her population of interest. The ratings are qualitative and not quantitative. With such small sample sizes, there is no way for all the expected counts to be at least 5.

Explanation / Answer

Solution . The answer to the question " why we can't use chi-square test" is. D. With such small sample size, there is no way for all expected counts to be at least 5.

Because if we try to do chi square test we will have 4*2 contingency table with (4-1)*(2-1) = 3 degree of freedom . Now expected frequency the column sum is always 10 for both which is carried at 4 places all those 4 values in both column can never be greater than 5 if in case we do pooling we cannot make tow 5 in each column .

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