In a study of the effectiveness of a fabric device that acts like a support stoc

Question

In a study of the effectiveness of a fabric device that acts like a support stocking for a weak or damage heart, 110 people who consented to treatment were assigned at random to either a standard treatment consisting of drugs or the experimental treatment that constructed of drugs plus surgery to Install the stocking. After two years, 30% of the 60 patients receiving the stocking had improved and 24% of the patients receiving the standard treatment had improved. (Use a statistical computer package to calculate the p value. Use. Round your test statistic to two domain places and your p-value to four decimal places.)

Explanation / Answer

here p1=0.3 ; n1=60

p2=0.24 ; n2=50

hence std error =(p1(1-p1)/n1+p2(1-p2)/n2)1/2 =0.0845

hence test statr z=(p1-p2)/std error =0.7097

p value for above z stat =0.4779

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