Question: No inference: sample size. One of the processes that turns genes on or off (so to speak) is called “DNA methylation.” Do low levels of this process help cause tumors? Compare mice altered to have low levels with normal mice. 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 compar4ing the proportions of normal and altered mice that develop tumors.