Find a 95% confidence interval for the porportion of all malpractice lawsuits the are dropped or dismissed.?

by wstera2

In a study of 1228 randomly selectede medical malpractice lawsuits, it was found that 856 of them were later dropped or dismissed (based on data from the P.I.A.A.

denniey
phat (+-) z* sqrt[phat(1-phat)/n]
phat=#success/#total
phat=856/1228=.697
.697 (+-) 1.960 * sqrt[.697(1-.697)/1228)]
.697(+-)1.960 * sqrt[1.7198E-4]
.697(+-)1.960 * .0131
.697(+-).0257
(.671,.723)
I am not positive since I have only started doing these for porportions, but I am pretty sure this right.

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Orignal From: Find a 95% confidence interval for the porportion of all malpractice lawsuits the are dropped or dismissed.?