At Community Hospital, the burn center is experimenting with a new plasma compress treatment. A random sample of n1 = 302 patients with minor burns received the plasma compress treatment. Of these patients, it was found that 268 had no visible scars after treatment. Another random sample of n2 = 408 patients with minor burns received no plasma compress treatment. For this group, it was found that 105 had no visible scars after treatment. Let p1 be the population proportion of all patients with minor burns receiving the plasma compress treatment who have no visible scars. Let p2 be the population proportion of all patients with minor burns not receiving the plasma compress treatment who have no visible scars. (a) Find a 95% confidence interval for p1 − p2. (Round your answers to three decimal places.)

Question

At Community Hospital, the burn center is experimenting with a new plasma compress treatment. A random sample of n1 = 302 patients with minor burns received the plasma compress treatment. Of these patients, it was found that 268 had no visible scars after treatment. Another random sample of n2 = 408 patients with minor burns received no plasma compress treatment. For this group, it was found that 105 had no visible scars after treatment. Let p1 be the population proportion of all patients with minor burns receiving the plasma compress treatment who have no visible scars. Let p2 be the population proportion of all patients with minor burns not receiving the plasma compress treatment who have no visible scars.

(a) Find a 95% confidence interval for p1p2. (Round your answers to three decimal places.)
lower limit      
upper limit      

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