A Survey of 25 Grocery Stores Revealed That the Mean

Multiple Choice

A survey of 25 grocery stores revealed that the mean price of a gallon of milk was $2.98,with a standard error of $0.10. If 90% and 95% confidence intervals were developed to estimate the true cost of a gallon of milk,what similarities would they have?

A) Both have the same confidence level.
B) Both use the same t-statistic.
C) Both use the same z-statistic.
D) Both use the same point estimate of the population mean.