Mathematics, 25.11.2019 19:31, LexyV1242

Arandom sample of size n1 = 16 is selected from a normal population with a mean of 75 and standard deviation of 8. a second random sample of size n2 = 9 is taken independently from another normal population with mean 70 and standard deviation of 12. let x1 and x2 be the two sample means. find
(a) the probability that x1 − x2 exceeds 4.
(b) the probability that 3.5 < x1 − x2 < 5.5.

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Arandom sample of size n1 = 16 is selected from a normal population with a mean of 75 and standard d...