To Test the Effect of Partial Day Care on Academic

Multiple Choice

To test the effect of partial day care on academic performance in young children, a researcher plans to use two groups of 4-year-olds from the same preschool class: one group is made up of randomly selected children who attend part-time day care; the other group includes randomly selected children who do not attend any day care other than preschool.Both groups will complete a brief test of academic performance during a regular preschool class.Which type of test should the researcher use to compare the mean scores of the two groups?

A) paired-samples t test
B) independent-samples t test
C) single-sample t test
D) z test