excel lab 2 q4.xlsx - Step 3 p-value...

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Step 3. p-value is .000000000365 '-0.2422 ≤ (p₁ - p₂) ≤ -0.1256 With 95% confidence, we estimate that the proportion of people who didn't develop the flu is -0.2422 to -.1256 lower than those who did develop the flu. Hypothesis test for two independent proportions p1 p2 0.13 0.25 0.19 p (as decimal) 62/500 125/500 200/1000 p (as fraction) 65 125 190 X 500 500 1000 n -0.12 difference 0 hypothesized difference 0.0248 std. error -4.84 z 6.61E-07 p-value (one-tailed, lower) -0.1681 confidence interval 95.% lower -0.0719 confidence interval 95.% upper 0.0481 margin of error
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