Question

Problem 3: A study examines chocolate's effects on blood vessel function in healthy people. In the randomized, double-blind, placebo- controlled study, 11 people received 46 grams (1.6 ounces) of dark chocolate (which is naturally flavonoid-rich) every day for two weeks, while a control group of 10 people received a placebo consisting of dark chocolate with low flavonoid content. Participants had their vascular health measured (by means of flow-mediated dilation) before and after the two-week study. The increase over the two-week period was measured, with larger numbers indicating greater vascular health. For the group getting the good dark chocolate, the mean increase was 1.3 with a standard deviation of 2.32, while the control group had a mean change of -0.96 with a standard deviation of 1.58. a. Find a 95% confidence interval for the difference in means between the two groups "-", where Mc represents the mean increase in flow-mediated dilation for people eating dark chocolate every day and "x represents the mean increase in flow-mediated dilation for people eating a dark chocolate substitute each day. You may assume that neither sample shows significant departures from normality. Please show your work including the formula that you are using. Round your answers to two decimal places. (5 points) Note: For a 95% confidence interval, t* = 2.262. b. Provide an appropriate interpretation (in the context of this problem) of your 95% confidence interval. (3 points) OOO DOC Dashboard Calendar To Do Notifications Inbox

Answer 1

We wish to find 95% confidence interval for Mc MM He: Mean Incepese in floco-mediated dilution for prople eating dock chocodate preeyday MH: Mees heese In Howo - Mediated dilation for people Berthel doɛk chocojulte substitute each day. We have top - = 2.262 Xc=1.3, Sc= 2.32 , nc = 11 XN = -0.96 , Sn = 1.58, Nx = 10 Isy. confidence integral for Me At is ne na 2-322 2.32, 1-582, 1.3-60.96) + 2.262 (*e** -toimisto, Ye-Tout to ( 2.26 1.584 To 2.26–1.945 , 2.26 +1.94) ܘܐ܂ (0.32, 4.2) gs y confidence interval for Me How is (0.32 , 4.20) Inteepeetution : We de 95% confident that teve meun difference of Me and My is die in this inteɛral since confidence integral contain only positive Irelles. je. MicMx Mo Je Me > HN it indicate that eating chocodete is good for Health.