Chapter 11, Problem 15P

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570

Chapter
Section

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570
Textbook Problem

The following data are from a repeated-measures study examining the effect of a treatment by measuring a group of n = 6 participants before and after they receive the treatment.a. Calculate the difference scores and MD.b. Compute SS, sample variance, and estimated standard error.c. Is there a significant treatment effect? Use α = .05, two tails.

a.

To determine
Difference scores and MD.

Explanation

Given info:

Scores of n=6 participants before and after the treatment are given.

 Participant Before Treatment After Treatment A 7 8 B 2 9 C 4 6 D 5 7 E 5 6 F 3 8

Calculation:

Difference of scores are given by the subtracting the scores before different treatment from the scores after treatment.

Step-by-step procedure to obtain the difference scores using the SPSS software is.

• Enter the name of four variables in variable view>Participants, Before_Treatment, After_Treatment, and Difference.
• Enter the values of given variables.
• Go to Transform>Choose Compute variable>Write Difference in Target Variable.
• Choose variable After_Treatment and move it to numeric expression> Choose () sign and move it to numeric expression>Choose variable Before_Treatment and move it to numeric expression.
• Choose OK.
• Choose Yes.

Output using the SPSS software is given below:

b.

To determine

To Compute: The value of SS, Sample variance and estimated standard error.

c.

To determine
Treatment has a significant effect.

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