Question Part Points Submissions Used In a study of the effectiveness of a fabri

Question

Question Part Points Submissions Used 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, 35% of the 60 patients receiving the stocking had improved and 26% of the patients receiving the standard treatment had improved. (Use a statistical computer package to calculate the P-value. Use pexperimental ? pstandard. Round your test statistic to two decimal places and your P-value to four decimal places.)

z=

p=

Explanation / Answer

n1 = 60
n2 = 50
p1cap = 0.35
p2cap = 0.26

pcap = (60*0.35 + 50*0.26)/110 = 0.3091

z = (0.35 - 0.26)/sqrt(0.3091*(1-0.3091)*(1/60+1/50))
z = 1.02

p-value = 0.1546

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