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, 30% of the 60 patients receiving the stocking had improved and 22% of the patients receiving the standard treatment had improved. (Use a statistical computer package to calculate the P-value. Use p_experimental − p_standard. Round your test statistic to two decimal places and your P-value to four decimal places.)

z	=
P	=

Answer 1

Sample number of events Sample Size Sample proportion General proportion Sample lim 60| x,-18 -0.3000 0.2636 p Sample 2 | n,-50| x,-11 | p2-2-0.2200 The test Statistic is, 0.95

P-value P(z 0.95)-0.1711