The formula used to calculate a confidence interval for the mean of a normal population is

x(tcritical value)

s

n

.

What is the appropriatetcritical value for each of the following confidence levels and sample sizes? (Usea tableortechnology. Round your answers to two decimal places.)

(a)95% confidence,

n=19

(b)99% confidence,

n=22

(c)90% confidence,

n=13

The formula used to calculate a confidence interval for the mean of a normal population is S x + (t critical value) What is the appropriate t critical value for each of the following confidence levels and sample sizes? (Use a table or technology. Round your answers to two decimal places.) (a) 95% confidence, n = 19 (b) 99% confidence, n = 22 (c) 90% confidence, n = 13