# Exercise 31 Essay

917 Words Nov 15th, 2012 4 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
9. Examine the means and standard deviations for Systolic BP at pretest, 3 months (completion of the treatment), and 6 months. What do these results indicate? Are these results clinically important? Provide a rationale for your answer. The mean and standard deviation for Systolic BP for pre-test is 121.7 and 14.6, for 3 months the means and standard deviations is 117.2 and 12.3 and for 6 months the mean and standard deviation is 115.6 and 13.4. These results are clinically important because we can see that the mean Systolic BP is decreased after 3 months and after 6 months. The treatment is effective in lowering the Systolic BP as the time passes. In a long run, these results can be significant.

10. Is this study design strong or weak? Provide a rationale for your answer. The design for this study is strong because the there is only one group and we want to see whether there is any significant difference or reduction in some measurement after receiving the treatment or therapy. This design serves the purpose of the study. The only drawback in this design is that there is no blinding of treatment.

Table 2

* p < 0.05. a Paired t-test results between the pretest and 3-month measures. b Paired t-test results between the pretest and 6-month measures.

Table 3

* p < 0.05. a Paired t-test results between the pretest

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