Which test is especially useful when the sample size is less than 30 and the population standard deviation is unknown?

Which test is especially useful when the sample size is less than 30 and the population standard deviation is unknown?

Which test is especially useful when the sample size is less than 30 and the population standard deviation is unknown? 







A. t-test

B. z-test

C. ANOVA

D. F-test

E. n-way ANOVA







Answer: A