Stats For Behav. Science W/mindtap
10th Edition
ISBN: 9781337367691
Author: GRAVETTER
Publisher: Cengage
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Textbook Question
Chapter 12, Problem 19P
For the preceding problem you should find that that there are significant differences among the three treatments. One reason for the significance is that the sample variances are relatively small. To create the following data, we kept the same sample means that appeared in problem 8 but increased the SS values within each sample.
Treatments | |||
I | II | III | |
4 | 4 | 9 | |
2 | 0 | 3 | |
6 | 3 | 6 | |
4 | 1 | 6 | |
- Calculate the sample variance for each of the three samples. Describe how these samples variances compare with those from problem 8.
- Predict how the increase in sample variance should influence the outcome of the analysis. That is, how will the F-ratio for these data compare with the value obtained in problem 8? Use an ANOVA with
- to determine whether there are any significant differences among the three treatment means. (Does your answer agree with your prediction in part b?)
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Chapter 12 Solutions
Stats For Behav. Science W/mindtap
Ch. 12 - Explain why the F-ratio is expected to be near...Ch. 12 - Describe the similarities between an F-ratio and a...Ch. 12 - Why should you use ANOVA instead of several ttests...Ch. 12 - Calculate SStotal , SSbetween , and SSwithin for...Ch. 12 - A researcher uses an ANOVA to compare three...Ch. 12 - A researcher reports an F-ratio with dfbetween=2...Ch. 12 - A researcher reports an F-ratio with df=2,27 from...Ch. 12 - A research report from an independent-measures...Ch. 12 - Treatment I II III n=10 n=10 n=10 SS=63 SS=66...Ch. 12 - A researcher conducts an experiment comparing four...
Ch. 12 - The following summary table presents the results...Ch. 12 - A developmental psychologist is examining the...Ch. 12 - The following data were obtained from an...Ch. 12 - The following data were obtained from an...Ch. 12 - A research study comparing three treatment...Ch. 12 - Several factors influence the size of the F-ratio....Ch. 12 - A researcher used ANOVA and computed and F-ration...Ch. 12 - The following data were obtained from an...Ch. 12 - For the preceding problem you should find that...Ch. 12 - The following data summarize the results from an...Ch. 12 - To create the following data we started with the...Ch. 12 - The following values are from an independent-...Ch. 12 - An ANOVA produces an F-ratio with df=1,34 . Could...Ch. 12 - The following scores are from an...
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