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 and30%of the patients receiving the standard treatment had improved. (Use a statistical computer package to calculate theP-value. Usep_experimentalp_standard.Round your test statistic to two decimal places and yourP-value to four decimal places.)

z=

P=

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 inAppendix Ato answer this question.