The following table gives data on the blood pressure before and after treatment

Question

The following table gives data on the blood pressure before and after treatment for two groups of black males Calcium group Placebo group Begin End Decrease Begin End Decrease 107 100 10 114 123 105 129 112 112 115 116 107 106 112 102 136 125 102 104 123 124 09 97 112 113 102 105 98 95 114 119 119 114 114 112 110 121 -4 18 17 -3 -5 12 130 133 You may use http://www.r-fiddle.org and the following commands. x1-c(7. -4, 18. 17, -3. -5. 1, 10, 11, -2) x2-c(-1, 12,-1,-3, 3,-5, 5, 2,-11,-1,-3 1. Enter the df (conservative formula) 2. Find sehat. Hint set n1 and n2 equal to the appropriate values (ie n1=some value and n2-some value in r-fiddle) before using the following command in r fiddle Round to 3 digits beyond the decimal (eg 0.123) 3. Find t" for the 95% CI from table D 4. Find the estimate for mu1- mu2 (that is, xbar1 - xbar2). Round to 3 digits beyond the decimal (eg 0.123) 5 Find the lower endpoint of the 95% CI for the difference in means. Round to 1 digit beyond the decimal (eg 0.1). 6, Find the lower endpoint of the 95% CI for the difference in means. Round to 1 digit beyond the decimal (eg 0.1). 7 Find the 95% that does not use the conservative df formula hint t test x1 x2 in r-fiddle This is called the Welch Two sample t The output from r fiddle will have the dr, round this to one digit beyond the decimal eg 0.1 8. Select exactly one from a, b, or c. a. The Welch interval contains the interval you obtained. b. The interval you obtained contains the Welch interval. C. Neither a nor b is true

Explanation / Answer

1) D.F (n1+n2-2)= (10+11-2)= (21-2)= 19 d.f

3) CRITICAL t value with 19d.f at 0.05 level of significance is 2.09 for two tailed.

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