MATLAB: An Introduction with Applications
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Transcribed Image Text:The authors of a research article were interested in the effect of watching movies that portrayed female heroines in roles that focus on their sex appeal on female viewers. They carried out an
experiment in which female college students were assigned at random to one of two experimental groups. The 22 women in one group watched 13 minutes of scenes from a certain superhero
film series and then responded to a questionnaire designed to measure body esteem. Lower scores on this measure correspond to lower body satisfaction. The 26 women in the other group
(the control group) did not watch any video prior to responding to the questionnaire measuring body esteem. For the women who watched a certain superhero video, the mean body esteem
score was 4.42 and the standard deviation was 1.02. For the women in the control group, the mean body esteem score was 5.06 and the standard deviation was 0.99. You may assume that
the distribution of body esteem scores for each of the two treatments (video and control) is approximately normal.
USE SALT
(a) Construct a 90% confidence interval for the difference in mean body esteem score for the video treatment and the no video treatment. (Use video
two decimal places.)
"no video*
Round your answers to
Interpret the interval.
O There is a 90% chance that the true difference in mean body esteem score for the video treatment and the no video treatment falls directly in the middle of this interval.
There is a 90% chance that the difference in mean body esteem score in this experiment for the video treatment and the no video treatment falls within this interval.
O There is a 90% chance that the difference in mean body esteem score in this experiment for the video treatment and the no video treatment falls directly in the middle of this
interval.
(b) Do you think that watching the video has an effect on body esteem? Explain.
The confidence interval ---Select---
O We are 90% confident that the difference in mean body esteem score in this experiment for the video treatment and the no video treatment falls within this interval.
O We are 90% confident that the true difference in mean body esteem score for the video treatment and the no video treatment falls within this interval.
to conclude that watching the video has an effect on mean body esteem score because zero ---Select--- included in the confidence interval.
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