Homework 20

Problems

Instructions:

1. For problems with unknown population standard deviations, use Welch's \(t\)-test via two.sample.t.test() to compute \(P\)-values and construct confidence intervals (bounds) as we did in class. Do not use the \(Z\)-statistic and do not compute these quantities by hand.
   • Be sure you specify the correct alternative hypothesis.
   • Be sure you specify the correct null difference.
   • Be sure you specify the correct significance (confidence) level.
2. For hypothesis tests, you should follow the full 7-step procedure of stating the claim, determining the null and alternative hypotheses, etc.

Section 10.1:

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• 2
• 3
• 4
• 7
• 8

Section 10.2:

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