(1 point) genetic influences on cancer can be studied by manipulating the genetic makeup of mice. one of the processes that turns genes on or off (so to speak) in particular locations is called "dna methylation". of 33 mice with lowered levels of dna methylation, 23 developed tumors. none of the control group of 18 normal mice developed tumors in the same time period. explain why we cannot safely use either the large-sample confidence interval or the test for comparing the proportions of normal and altered mice that develop tumors.