Two random samples of sizes 30 and 36 are selected independently from two populations with means 80 and 88,and standard deviations 15 and 20,respectively.
a.Find the standard error of the difference between
and
.
b.Find the probability that the mean of the first sample is smaller than the mean of the second sample.
Correct Answer:
Verified
b. P(
< 0)= P(Z < 1.85...View Answer
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