4. Let X1 and X2 be random samples from a standard normal distribution, answer the following questions a. What is the distribution of -? b. What is the distribution of (x, +X;)? :? z(*x-*x) .? X,+X, c. What is the distribution of- z(*x-'x)^ d. What is the distribution of if Z ?

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A: Given Information: n1=n2=n3=n4=20 x¯1=2.80, x¯2=2.75,  x¯3=2.10,  x¯4=1.85 s1=0.30,  s2=0.36,…

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Q: The gestation period of humans follows a normal distribution with a mean of 266 days anc standard…

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