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Save : Experimental studies of cancer often use strains of animals that have 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 the other group was exposed to the intestinal bacterium Escherichia coli. The proportions of tumors in the two groups were then observed and the test statistic was calculated to be z = 1.40. If we want to test if there is a difference in the proportion of tumors for the two groups at the 2% significance level, what is the p-value? answer correct to 4 decimals