Refer to the liver tumor data of Exercise 10.2.9.
(a) Construct a 95% confidence interval for (Pr{liver tumor | germ-free} - Pr{liver tumor | E. coli}).
(b) Interpret the confidence interval from part (a). That is. explain what the interval tells you about tumor probabilities.
Exercise 10.2.9
Experimental studies of cancer often use strains of animals that have a naturally high incidence of tumors. In one such experiment, tumor-prone mice were kept in a sterile environment; one group of mice was maintained entirely germ free, while another group was exposed to the intestinal bacterium Escherichia coli. The accompanying table shows the incidence of liver tumors.

Transcribed Image Text:

Mice with liver tumors Number Treatment Germ free E, coli Total number of mice 49 13 Percent 39% 62% 19