Statistics

Question 3

Explain the difference between a matched-subjects design and a repeated-measures design.

Question 4

A researcher conducts an experiment comparing two treatment conditions and obtains data with 10 scores for each treatment condition.

1. If the researcher used and independent-measures design, how many subjects participated in the experiment?
2. If the researcher used a repeated-measures design, how many subjects participated in the experiment?
3. If the researcher used a matched-subjects design, how many subjects participated in the experiment?

Question 22

A variety of research results suggest that visual images interfere with visual perception. In one study, Segal and Fusella (1970) had participants watch a screen, looking for brief presentations of a small blue arrow. On some trials, the participants were also asked to form a mental image (for example, imagine a volcano). The results show that participants made more errors while forming images than while not forming images. Data similar to the Segal and Fusella results are as follows. Do the data indicate a significant difference between the two conditions? Use a two-tailed test with = 05.

Participant Errors with image Errors without image

A 13 4

B 9 2

C 12 10

D 7 8

E 10 6

F 8 6

G 9 4

Question 23

People with agoraphobia feel such a high level of anxiety about being in public places that they seldom leave their homes. Knowing this is a difficult disorder to treat, a researcher tries a long-term treatment. A sample of individuals report how often they have ventured out of the house in the past month. Then they receive relaxation training and are introduced to trips away from the house at gradually increasing durations. After 2 months of treatment, participants report the number of trips out of the house they made in the last 30 days. The data are as follows:

Participant Before Treatment After Treatment

A 0 4

B 0 0

C 3 14

D 3 23

E 2 9

F 0 8

G 0 6

Does the treatment have a significant effect on the number of trips a person takes? Test with = .05, two tails.

SPSS Assignment 2

The Oak Harbor School used the Dumbarton University Math Battery (DUMB) to test the math achievement of the two 6th-grade sections. The principal was able to obtain the student scores from an administration of the same test the prior year. Using these earlier scores as a pre-test, she would like to know if the students have demonstrated significant growth in achievement.

• Use the data table created in Week 9 Assignment 1.
• State the null and alternative hypotheses for testing the means of these related samples.
• Conduct a two-tailed t test for related (related/repeated) samples at the .05 level.
• Copy or copy object and paste relevant output from the statistical test.
• State whether or not the null hypothesis is accepted or rejected based on the results of the statistical test. Use the conventions described by Gravetter and Wallnau on pages 282–285 to present your report.
• In a brief paragraph, explain what your findings mean in relation to the experiment discussed in the problem.

Price: $14.82

Solution: The downloadable solution consists of 6 pages, 882 words and 2 charts.
Deliverable: Word Document