Question: The difference between the second and third organisms. Why is the significance level different from that in Exercise 39 even though the observed difference of

The difference between the second and third organisms. Why is the significance level different from that in Exercise 39 even though the observed difference of 10 mutations is the same in each case?
One organism has 8 mutations in 1 million base pairs, a second has 18 in 1 million, and a third has 28 in 1 million. Use the normal approximation to test whether the above differences are significant.

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