Question

A researcher is looking at the impact that television has on children. Children are placed in a room with a variety of toys and a television playing a cartoon. The researcher predicts that the children will spend more than half of their 30 minutes looking at the television. The researcher tested 15 children and found a sample mean of M= 17 minutes spent watching the television with SS = 79. In order to test this hypothesis, what does the researcher need?a. A one-tailed z-score b. A two-tailed z-score c. A one-tailed t statistic d. A two-tailed t statistic

Answer 1

c. A one-tailed t statistic

Explanation:

firstly; sample size n < 30 we use a t-test

A t-test is necessary for small samples because their distributions are not normal.

Also One-tailed tests have more statistical power to detect an effect in one direction