A simple random sample of size41has mean=70.89and standard deviations=15.73. The population distribution is unknown. Determine the correct method of finding a90% confidence interval for the population mean and compute it.

Question 6 options:

A)

z-method: (66.85,74.93)

B)

z-method: (66.75,75.03)

C)

t-method: (66.75,75.03)

D)

Cannot compute: the population size is too small.