1. What are the two groups whose results are reflected by the t ratios in Tables 2 and 3?
Table 2 reflects the program’s effects on cardiovascular risk factors.
Table 3 reflects the program’s effects on health behavior.
2. Which t ratio in Table 2 represents the greatest relative or standardized difference between the pretest and 3 months outcomes? Is this t ratio statistically significant? Provide a rationale for your answer.
The t ratio for Table 2 represents the greatest relative or standardized difference between the pre-test and 3 months outcomes because the value of t test statistics is bigger than any other group.
This ratio is statistically significant because the p-value corresponding to this group is less than 0.05.
3. Which t ratio listed in Table 3 represents the smallest relative difference between the pretest and 3 months? Is this t ratio statistically significant? What does this result mean?
The T-ratio is 0.80.
This value is not statistically significant.
The value is less than 1.96.
This means the program has no effect on health behaviors. 4. What are the assumptions for conducting a t-test for dependent groups in a study? Which of these assumptions do you think were met by this study?
Several assumptions for t-test for dependent/matched groups in a study are applied. It is assumed that the difference between the two groups of the dependent t-test is normally distributed.
The dependent variable is interval or ratio.
Any independent variable consists of one group or two “matched pair” groups.
All subjects are assumed to have been surveyed the same and data collection was unbiased.
The assumption that was met in this study is the normal distribution. 5. Compare the 3 months and 6 months t ratios for the variable Exercise from Table 3. What is your conclusion about the long-term effect of the health-promotion