all Verizon 5:14 PM 31%) eBlook 0.16/0.64 points Previcus Answers MintroStat9 13
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all Verizon 5:14 PM 31%) eBlook 0.16/0.64 points Previcus Answers MintroStat9 13E 518.XP My Notes Ask Your The National Crime Victimization Survey estimates that there were over 400,000 violent crimes committed against women by their intimate partner that resulted in physical injury. An intervention study designed to increase safety behaviors of abused women compared the effectiveness of six telephone intervention sessions with a control group of abused women who received standard care. Fifteen different safety behaviors were examined. One of the variables analyzed was the total number of behaviors (out of 15) that each woman performed. Here is a summary of the means of this variable at baseline (ust before the first telephone call) and at folow-up 3 and 6 months later Time 3 months 6 months 12.5 9.9 (a) Find the marginal means. (Round your answers to three decimal places.) 10.4 9.6 11.9 10.4 3 months 6 months 10.4 12.5 9.6 9.9 10.4 sults of this Are they useful for understanding the re O The row means suggest that the intervention group showed more improvement than the control group. O The row means suggest that the control group showed more improvement than the 3 months group. The row means suggest that the control group showed more improvement than the baseline group. The row means suggest that the intervention group showed more improvement than the 6 months group. O The row means suggest that the intervention group showed less improvement than the control group. (b) Plot the means. Do you think there is an interaction? Describe the of an interaction for this study O Yes there is an interaction, it means that the mean number of actions changes consistently over time for the two O Yes there is an interaction, it means that the mean number of actions changes differently over time for the two O Yes there is an interaction, it means that the mean number of actions does not change over time for the two groups. O No there is not an interaction, meaning that the mean number of actions does not change over time for the two groups (Note: This exercise is from a repeated-measures design, and the data are not particularly normal because they are counts with values from 1 to 10. Although we cannot use the methods in this chapter for statistical inference in this setting, the example does illustrate ideas about interactions.) eBlook Submit Answer Save Progress Practice Another VersionExplanation / Answer
11.
The row means for Intervention = (10.4 + 12.5 + 11.9) /3 = 11.6
The row means for Control = (9.6 + 9.9 + 10.4) /3 = 9.97
Options for (a) and (b) are correct.
12.
(a)
The lines are not parallel. So, there is interaction between chromium levels and Eat group.
For Eat-R, mean GITH level is higher than Eat-M (notice how the line for Eat-R is above the line for Eat-M). So, there is main effect of Eat group. So, restricting the diet rather than the rats eats as much as they want appear to have an effect on GITH level.
On the average, Eat-R scores higher then Eat-R, while averages GITH level for Low and Normal chromium level are about the same. So, there is no effect of chromium levels. So, the amount of chromium does not appear to affect the mean GITH level.
(b)
Marginal means are calculated as below.
Difference between M and R diets for L level = 5.175 - 4.545 = 0.63
Difference between M and R diets for N level = 5.317 - 4.425 = 0.892
For Eat-R, mean GITH level (5.246) is higher than Eat-M (4.485) So, there is main effect of Eat group. So, restricting the diet rather than the rats eats as much as they want appear to have an effect on GITH level.
The averages GITH level for Low and Normal chromium level (4.86 and 4.871) are about the same . So, there is no effect of chromium levels. So, the amount of chromium does not appear to affect the mean GITH level.
The difference between M and R diets for L level (0.63) is not equal to difference between M and R diets for N level (0.892). So, the lines are not parallel and there is interaction between chromium levels and Eat group.
Chromium M R Marginal Means L 4.545 5.175 4.86 N 4.425 5.317 4.871 Marginal means 4.485 5.246 4.8655Related Questions
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