Homework Answers
By using a TI-84 calculator we can solve this question easily.
n1 = 80
x1 = 15
n2 = 150
x2 = 20
We have to construct a confidence interval for the difference in the proportion of surgeons and general practitioners who smoke.
If we have not given the level of significance we can take it 0.05
Ti-84 calculator path is click on STAT ------->TESTS ---------->2-PropZInt ---------> Enter values ------>
x1 = 15
n1 = 80
x2 = 20
n2 = 150
C-Level: 0.95
Calculated
We get confidence interval ( - 0.0472 , 0.1555)
Interpretation: We are 95% confidence that difference in the population proportion lies into above confidence interval.
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