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 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 and 32% 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

The statistical software output for this problem is:

Two sample proportion hypothesis test:
p1 : proportion of successes for population 1
p2 : proportion of successes for population 2
p1 - p2 : Difference in proportions
H0 : p1 - p2 = 0
HA : p1 - p2 0
Note: the standard error is calculated using a pooled estimate for the proportion

Hypothesis test results:

Hence,

z = 1.39

p - value = 0.1641

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