Question

In a study of the effectiveness of a fabric device that acts like a support stocking for a weak or damaged heart, 110 people who consented to treatment were assigned at random to either a standard treatment consisting of drugs or the experimental treatment that consisted of drugs plus surgery to install the stocking. After two years, 45% of the 60 patients receiving the stocking had improved and 38% of the patients receiving the standard treatment had improved. Use a statistical computer package to calculate the P-value. UsePe perimental-psta dard Round your test statistic to two decimal places and your P-value to four decimal places.) -0.89 P= 0.1878 Do these data provide convincing evidence that the proportion of patients who improve is higher for the experimental treatment than for the standard treatment? Test the relevant hypotheses using a significance level of 0.05. Yes No You may need to use the appropriate table in Appendix A to answer this question. Need Help? Read Read It Talk to a Tutor

Answer 1

Answer Date: 25/04/2019 The z-test statistics is, By using Excel software, find z-test statistics with the help of following steps 1) Import the data. 2) Select the MegaStat from Add-Ins option. 3) Select the Compare Independent Two Proportions from Hypothesis Tests. 4) Select data input 5) Select Confidence level, Test difference and alternative hypothesis 6) Click Ok.

Hypothesis test for two independent proportions pc 0.45 0.38 0.4182 p (as decimal) 27/60 19/5046/110p (as fraction) 27. 19. 46. X 60 50 110 n 0.07 difference 0. hypothesized difference 0.0945 std. error 0.74 z 2293 p-value (one-tailed, upper) From the Excel output, thez-test statistics is 0.74 Thep-value for this test is, From the Excel output, thep-value for this test is 0.2293 The t-test statistics and degree of freedom is

By using Excel software, find t-test statistics with the help of following steps 1)Import the data 2) Select t-test: Paired Two Samples for Means from Data Analysis in Dat:a menu 3) Select Variable 1 Range and Variable 2 Range 4)Give Hypothesized Mean Difference 5) Select Labels and give Alpha. 6) Choose Output Range from Output options 7) Cick Ok t-Test: Paired Two Sample for Means Chocolate milk Carbohydrate 42.8566666729.38666667 208.7277 Mean Variance Observations Pearson Correlation Hypothesized Mean Difference df t Stat P(T< one-tail t Critical one-tail P(T<-t) two-tail t Critical two-tail 163.079075 0.642290198 3.480445546 0.004157095 1.859548033 0.008314189 2.306004133

From the Excel output, the +-test statistics is 3.48 and degree of freedom is 8 The p-value for this test is From the Excel output, thep-value for this test is 0.004