Question

A psychologist decided to measure a participant’s response to different colors.  Assume that the population of participant’s responses follows a normal distribution.  In one experiment, the random participant must press a key immediately after seeing a blue computer screen.  The reaction time (in seconds) to press a computer key is measured.  The same person is then asked to press a computer key immediately after seeing a red computer screen.  The result for n=6 participants are as follows:

      Subject    Group 1: BLUE reaction time                 Group2:   RED reaction time                  

1          .582                                         .408                           

2          .481                                         .407                            

3          .841                                         .542                            

4          .267                                         .402                            

5          .685                                         .456                            

6          .45                                           .533                            

The researcher wishes to investigate if there is a difference between the reaction time to the blue screen and the reaction time to the red screen.  She wishes to perform this test with 95% confidence.

1.      The sampling method, and subsequent hypothesis testing procedure, is based on which of the following:

		a.       Independent Sampling, we are taking a random sample.
		Dependent (Matched-Pair) Sampling, we are testing the same person. c.
		Either sampling method is correct and appropriate.
		Random Sampling.

Answer 1

1. Here we see that observation is done on the same sample, hence it is dependent data

So answer here is

Dependent (Matched-Pair) Sampling, we are testing the same person.