In a comparative study of two new drugs, A and B, 350 patients were treated with drug A, and 225 patients were treated with drug B. (The two treatment groups were randomly and independently chosen.) It was found that 241 patients were cured using drug A and 157 patients were cured using drug B. Let p1 be the proportion of the population of all patients who are cured using drug A, and let p2 be the proportion of the population of all patients who are cured using drug B. Find a 90% confidence interval for −p1p2 . Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your responses to at least three decimal places. (If necessary, consult a list of formulas.) What is the lower limit of the 90% confidence interval?   What is the upper limit of the 90% confidence interval?

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In a comparative study of two new drugs, A and B,
350
patients were treated with drug A, and
225
patients were treated with drug B. (The two treatment groups were randomly and independently chosen.) It was found that
241
patients were cured using drug A and
157
patients were cured using drug B. Let
p1
be the proportion of the population of all patients who are cured using drug A, and let
p2
be the proportion of the population of all patients who are cured using drug B. Find a
90%
confidence interval for
−p1p2
. Then complete the table below.

Carry your intermediate computations to at least three decimal places. Round your responses to at least three decimal places. (If necessary, consult a list of formulas.)

What is the lower limit of the 90% confidence interval?
 
What is the upper limit of the 90% confidence interval?
 
 
 
 
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