Question

a teacher is experimenting with a new computer - based instruction and conducts a study to test its effectiveness. in which situation could the teacher use a hypothesis test for matched pairs? select one answer. 10 points a. the teacher gives each student in the class a pretest. then she teaches a lesson using a computer program. afterwards, she gives each student a post - test. the teacher wants to see if the difference in scores will show an improvement. b. the teacher randomly divides the class into two groups. one of the groups receives computer - based instruction. the other group receives traditional instruction without computers. after instruction, each student takes a test and the teacher wants to compare the performance of the two groups. c. the teacher uses a combination of traditional methods and computer - based instruction. she asks students which they liked better. she wants to determine if the majority prefer the computer - based instruction.

Explanation:

In a hypothesis test for matched - pairs, the same subjects are measured twice under different conditions or at different times. In option A, the same students take a pre - test and then a post - test after computer - based instruction, which is an example of a matched - pairs design. Option B is an independent samples design as it compares two different groups. Option C is about preference and not a matched - pairs hypothesis test situation.

Answer:

A. The teacher gives each student in the class a pretest. Then she teaches a lesson using a computer program. Afterwards, she gives each student a post - test. The teacher wants to see if the difference in scores will show an improvement.