“Testing the Difference Between Two Means.” (Note: Please respond to one  of the following two  bulleted items)
What two assumptions must be met when you are using the z test to test differences between two means? Can the sample standard deviations s1 and s2 be used in place of the population standard deviations Ïƒ1 and Ïƒ2?
Retired workers and disabled workers both receive Social Security benefits. What information would we need to test the claim that the difference in monthly benefits between the two groups is greater than $30 at the 0.05 level of significance? Write out the hypotheses and explain the testing procedure.
Week 10 Internet Resources
Resources from the Internet can be valuable supplementary resources for self-study. One of the most widely acclaimed resources is the â€œ Kahn Academyâ€ which has a large library of short videos on math and other topics. The following is a list of Kahn Academy videos about topics covered in this weekâ€™s lessons. You may wish to explore this resource on your own, if you see fit.
Click here to view the video titled Regression Line Example.
Click here to view the video titled Correlation and Causality.
Click here to view the video titled R-Squared or Coefficient of Determination.
Click here to view the video titled Pearson’s Chi Square Test (Goodness of Fit).
Click here to view the video titled Contingency Table Chi-Square Test.
Click here to view the video titled ANOVA 3 -Hypothesis Test with F-Statistic.
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