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##### Quant-STATS Week 3 Homework Assignment

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Question;1. Jackson, even ?numbered Chapter Exercises, pp. 308?310.2) What is the difference between a randomized ANOVA and a repeated measures ANOVA? What does the term one ?way mean with respect toANOVA?4) If a researcher decides to use multiple comparisons in a study with three conditions, what is the probability of a Type I error across thesecomparisons? Use the Bonferroni adjustment to determine the suggested alpha level.6) When should post ?hoc comparisons be performed?8) Why is repeated measures ANOVA statistically more powerful than a randomized ANOVA?10) In a study of the effects of stress on illness, a researcher taillied the number of colds people contracted during a 6?month period as a function of the amount of stress they reported during the same period. There were three stress levels: minimal, moderate, and high stress. The sums of squaresappear in the following ANOVA summary table. The mean for each condition and the number of subjects per condition and the number of subjects per condition are also noted.Source df SS MS fBetween groups 22.167Within groups 14.750Total 36.917Stress level Mean Nminimal 3 4moderate 4 4maximum 6 4A) Complete the ANOVA summary tableB) Is F obt significant at a=.05, or at a=.01C) Perform post hoc comparisons if necessary.D)What conclusions can be drawn from the F?ratio and the post hoc comparisons?E) What is the effect size? What does it mean?F) Graph the means.12) A researcher conducted an experiment on the effects of a new ?drug? on depression. The researcher had a control group that received nothing, a placebo group and an experimental group that received the ?drug?. A depression inventory that provided a measure of depression on a 50?point scalewas used (50 indicates that an individual is very high on the depression variable). The ANOVA summary table appears next, along with the mean depressing score for each condition.source df ss ms fbetween groups 1,202.313within groups 2,118.00total 3,320.313drug condition mean ncontrol 36.26 15placebo 33.33 15drug 24.13 15A. complete the ANOVA summary tableb. Is f obt significant at?=.05, at?=.01?c. Perform post hoc comparisons if necessaryd. What conclusions can be drawn from the F ration and the post hoc comparisons?e. What is the effect size, and what does this mean?f. Graph the means14) A researcher has been hired by a pizzeria to determine which type of crust customers prefer. The restaurant offers three types of crust: hand? tossed, thick, and thin. Following are the mean number of l?inch pieces of pizza eaten for each condition from 10 subjects who had the opportunity toeat as many pieces with each type of crust as they desired. The ANOVA summary table also followsSource df ss MS FSubject 2.75Between 180.05Error 21.65Total 204.45Crust type Mean nHand?tossed 2.73 10Think 4.20 10thin 8.50 10a) Complete the ANOVA summary table.b) Is Fobt significant at a =.05, at a =.01?c) Perform post hoc comparisons if necessary.d) What conclusions can be drawn from the F?ratio and the post hoc comparisons?e) What is the effect size, and what does this mean?f) Graph the means2. What is an F?ratio? Define all the technical terms in your answer.3.What is error variance and how is it calculated?4. Why would anyone ever want more than two (2) levels of an independent variable?5. If you were doing a study to see if a treatment causes a significant effect, what would it mean if within groups variance was higher than between groups variance? If between groups variance was higher than within groups variance? Explain your answer 6. What is the purpose of a post?hoc test with analysis of variance?7. What is probabilistic equivalence? Why is it important?

Paper#61940 | Written in 18-Jul-2015

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