A Survey of 50 Retail Stores Revealed That the Average

Multiple Choice

A survey of 50 retail stores revealed that the average price of a microwave was $375,with a sample standard deviation of $20. If 90% and 95% confidence intervals were developed to estimate the true cost of the microwave,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.