Question

A random sample of 100 pumpkins is obtained and the mean circumference is found to be 40.5 cm. Assuming
that the population standard deviation is known to be 1.6 cm, use a 0.05 significance level to test the claim that the
mean circumference of all pumpkins is less than 39.9 cm. Which is the appropriate test for this data?
A. two-tailed t test B. one-tailed t test C. two-tailed z test D. one-tailed z test

Answer 1

Answer is B