(a) You wish to estimate the mean percentage price change for
all supermarkets in the Foodmart chain. From the sample of 150
stores, we have calculated the sample mean,
x = 4.092 and sample standard deviation, s = 0.795.
(i) Calculate the 99% confidence interval estimate of the mean
percentage change
for all supermarkets in the Foodmart chain.
(ii) Provide a plain language interpretation of the interval you
have just constructed.
(iii) Nationally, the Food component of the Australian CPI...