SOLUTION: You are conducting a study to see if the proportion of women over 40 who regularly have mammograms is significantly less than 0.81. You use a significance level of α=0.02.

Question 1148655: You are conducting a study to see if the proportion of women over 40 who regularly have mammograms is significantly less than 0.81. You use a significance level of α=0.02.
H0:p=0.81
H1:p<0.81
You obtain a sample of size n=249 in which there are 181 successes.
What is the test statistic for this sample? (Report answer accurate to three decimal places.)
test statistic =
What is the p-value for this sample? (Report answer accurate to four decimal places.)
p-value =
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
p hat=181/249=0.727
test stat is a z=(0.727-0.81)/sqrt(0.81*0.19/249) it is difference of means/sqrt(p*(1-p)/n)
=-0.083/0.0249=-3.342
p=0.0004
To get this result, round only at the end.
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