On average it has been found in grocery stores that 1%of scanned items are priced incorrectly. Recently, a sample of1,034 randomly selected items were scanned and 20 were found to bepriced incorrectly. Has the rate of incorrectly priced itemschanged?
A. What is the appropriate testprocedure?
a) z-test of themean b) t-test of the mean
c) z-test of the proportion d)none of these.
