proportion of customers who are completely satisfied in a recent
satisfaction survey of 400 customers at XYC Inc. is found to be
0.24. (6 points)
- Test the hypothesis that the population proportion of customers
who are completely satisfied is greater than 0.21 using the
critical value approach and a 0.05 level of significance.
- Test the hypothesis that the population proportion of customers
who are completely satisfied is less than 0.28 using the p-value
approach and a 0.05 level of significance.
- Test the hypothesis that the population proportion of customers
who are completely satisfied is different from 0.22 using the
p-value approach and a 0.05 level of significance.