Exercise 31 Essay example

916 WordsNov 21, 20124 Pages
1. What are the two groups whose results are reflected by the t ratios in Tables 2 and 3? The two groups are pre-test and 3-month measures and pre-test and 6-month measures. 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 Total risk score 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…show more content…
What is your conclusion about the long-term effect of the health-promotion intervention on Exercise in this study? We can see that the magnitude of the score value is larger at 3 months and levels off at 6 months, thus we conclude that over time the long-term health-promotion intervention on Exercise in this study has less of an effect than in the short-term. 6. What is the smallest, significant t ratio listed in Table 2? Provide a rationale for your answer. The smallest significant t ratio is 2.03 for variable Cholesterol at 3 months. This ratio is significant at 5% level and this is smallest among all other significant t ratios. 7. Why are the larger t ratios more likely to be statistically significant? The larger t ratios are more likely to be statistically significant because it takes a larger difference between the treatment and comparator with smaller variation. The larger the t ratios the more confident we are about our results. In terms of mathematics, the 99% of the observation for t distribution falls between -3 and +3. So if the t ratio lies outside these values we are more likely to get significant results. 8. Did the health-promotion program have a statistically significant effect on Systolic blood pressure (BP) in this study? Provide a rationale for your answer. No, the health-promotion program do not have a statistically significant effect on Systolic blood pressure (BP) in this