4. A computer program has produced the following output for a hypothesis-testing problem: Difference in sample means: 2.35 Degrees of freedom: 18 Standard error of the difference in sample means: ? Test statistic: to= 2.01 p-value: 0.0298 (a) What is the missing value for the standard error? (b) Is this a two-sided or a one-sided test? (e) If a = 0.05, what are your conclusions? (d) Find a 90% two-sided CI on the difference in means.

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