12 Jul WHAT TEST CAN BE PERFORMED TO ASSESS WHETHER THERE IS A SIGNIFICANT DIFFERENCE IN MEAN BLOOD GLUCOSE LEVEL BETWEEN MEN WITH AND WITHOUT STENOSIS?
The mean 1 sd of the ln {calcium intake (mg)} among 25 females, 12 to 14 years of age, below the poverty level is 6.56 0.64. Similarly, the mean 1 sdof ln {calcium intake (mg)} among 40 females, 12 to 14 years of age, above the poverty level is 6.800.76 Question 8.3 What is the appropriate procedure to test for a significant difference in means between groups? Question 8.4 Implement the procedure in Problem 8.3 using the critical-value method. Question 8.5 What is the p-value corresponding to your answer in Problem 8.4? Question 8.6 Compute a 95% CI for the difference in means between the two groups? ____________________________________ Table 8.20 – Overnight sodium excretion (mEq/8hr) before and after dietary consulting. Person Week 0 – Baseline Week 1 Difference 1 7.85 9.59 -1.74 2 12.03 34.50 -22.47 3 21.84 4.55 17.29 4 13.94 20.78 -6.84 5 16.68 11.69 4.99 6 41.78 32.51 9.27 7 14.97 5.46 9.51 8 12.07 12.95 -0.88 x s 17.65 10.56 16.50 11.63 1.14 12.22 Problem 8.58 What are appropriate hypothesis to test whether dietary counseling is effective in reducing sodium intake over a 1 week period (as measured by overnight urinary sodium excretion)? Problem 8.59 Conduct the test mentioned in Problem 8.58, and report a p value. Problem 8.60 Provide a 95% CI for the true mean change in overnight sodium excretion over a 1 week period. ____________________________________ Table 8.29 Comparison of Blood Glucose level between men with and without stenosis. No stenosis (n=356) Stenosis (n=108) Mean sd Mean sd Blood glucose (mmol/L) 5.3 1.4 5.1 0.8 Problem 8.111 What test can be performed to assess whether there is a significant difference in mean blood glucose level between men with and without stenosis? (Hint: F 355,107,.95 =1.307;F355,107,.975 = 1.377). Problem 8.112 Implement the test mentioned in Problem 8.111, and report a p-value (two-tailed). ———————————————————- Table 8.40 Mean HgbA1c 1 year before and 1 year after use of the insulin pump. ID Mean HgbA1c 1 year before (%) Mean HgbA1c 1 year after (%) Before After (%) 1 6.7 7.0 -0.3 2 7.4 7.4 0 3 9.2 8.6 0.6 4 9.6 8.1 1.5 5 7.4 6.8 0.6 6 8.1 7.0 1.1 7 10.8 8.5 2.3 8 7.1 7.7 -0.6 9 7.9 9.7 -1.8 10 10.8 7.7 3.1 Mean sd 8.5 1.5 7.9 0.9 0.65 1.44 Problem 8.163 What test can be used to compare the mean HgbA1c 1 year before vs. mean HgbA1c 1 year after use of the insulin pump? Problem 8.164 Perform the test in Problem 8.163, and report a two-tailed p value. Problem 8.165 Provide a 95% CI for the mean difference in HgbA1c before minus the mean HgbA1c after use of the insulin pump.
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