Genetic influences on cancer can be studied by manipulating the genetic makeup of mice. One of the processes that turn genes on or off (so to speak) in particular locations is called "DNA methylation." Do low levels of this process help cause tumors? Compare mice altered to have low levels with normal mice. Of 32 mice with lowered levels of DNA methylation 22 developed tumors. None of the control group of 15 normal mice developed tumors in the same time period.

One of the counts is 0. For large-sample intervals, all counts must be at least 10, and for significance testing, all counts must be at least 5.

Give a 99% confidence interval for the difference in the proportions of the two populations that develop tumors. (Round your answers for  and SE to four decimal places and your confidence interval bounds to three decimal places.)

Answer:

_{P altered}= _________

P normal= ________-

99% confidence interval

(_________ , __________)