A consultant performs a survey with the following results:
Brand/Satisfied YES NO
A 52 28
B 33 19
The consultant wishes to determine if there is a significant difference between brands in the proportion of satisfied customers. Perform a level hypothesis test for the difference of proportions. What are the sample proportions for each brand?
What are the null and research hypotheses? What is the test statistic and p-value? What is the statistical decision? Justify your answer. What is the conclusion? Determine a 95% CI for the difference in proportions.