rovided below are summary statistics for independent simple random samples from two populations. Use the pooled t-test and the pooled t-interval procedure to conduct the required hypothesis test and obtain the specified confidence interval. X1=20, S1=6, N1=21, X2=22, S2=7, N2= 15 Left tailed test, a=.05 90% confidence interval The 90% confidence interval is from ____ to ____
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