IA Ex. 17.7
In a survey about satisfaction with local phone service, those
respondents who rated their current service as excellent and those who
rated it Poor-Very Poor were asked to classify their current local
service provider. The results are given in the table below:
Type of Company
Current Service Source Long Distance Local Phone
Power
Cable TV Cellular Phone
Statistics Homework Solutions
#10910
Chi-square test
a). Set up the hypotheses to test whether the proportion of people who rated their company as excellent is the same for each type of company.
b). Calculate the overall proportion of people who rate their current phone service as excellent.
c). Find the expected frequency for each cell and calculate the chi-square test statistic.
d). If you wanted to perform the test at the 0.05 level of significance, what would the critical value of the test be?
e). At the 0.05 level of significance, is there a difference in the proportion of people who rate their local phone service as excellent among the different types of companies
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By OTA - Overall OTA Rating
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