Discussion:
Q: A large supermarket conducted a consumer preference study by recording the brand of wheat bread pruchased by customers in its stores. The supermarket carries four brands of wheat bread and the brand preferences of a random sample of 200 purchasers are given in the following table:
BRAND
A=51
B=82
C=27
D=40
Test the null hypothesis that the four brands are equally preferred by setting x equal to .05. Find a 95% confidence interval for the proportion of all purchasers who prefer brand B