X1 20 s1 4 n1 30 x2
x1 = 20, s1 = 4, n1 = 30, x2 = 18, s2 = 5, n2 = 40
a. Right-tailed test, α = 0.05
b. 90% confidence interval
We have provided summary statistics for independent simple random samples from two populations. In each case, use the pooled t-test and the pooled t interval procedure to conduct the required hypothesis test and obtain the specified confidence interval.
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