Question

when constructing a confidence interval for a population mean, which of the following is the best reason for using a t critical value rather than a z critical value? (a) When the sample is less than 30. (b) When we are estimating the population standard deviation with the samplestandard deviation (c) When np and n(1-p) are not at least 10 (d) When we want less confidence

Answer 1

answers below

Explanation:

(a) When the sample is less than 30. (b) When we are estimating the population standard deviation with the sample standard deviation