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11.21: Assignment- Two Independent Samples

  • Page ID
    251461
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    The purpose of this activity is to give you guided practice in obtaining and interpreting a 95% confidence interval for μ1 − μ2 following a two-sample T-test that rejected H0. Recall our second example:

    Our variable Age Group (X) has two categories: males 20–29 years old and males 75+ years old. These two groups form our two populations. For each population we have a separate μ, representing the weight (Y) mean of that population. For each population we take an SRS. From population 1 of males 20–29 years old, we obtain an SRS of size 712, and find that it has a mean of 83.4 and SD of 18.7. From population 2 of males 75+ years old, we take an SRS of size 1001 and find that it has a mean of 78.5 and SD of 19.0. 

    Instructions

    Click on the link corresponding to your statistical package to see instructions for completing the activity, and then answer the questions below.

    R | StatCrunch | Minitab | Excel 2007 | TI Calculator

    Question:

    Obtain the 95% confidence interval for μ1 – μ2 and interpret it in context.

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