Answer & Explanation:”Testing the Difference Between Two Means.”
(Note: Please respond to one  of the following two 
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 σ1 and σ2?
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
from the Internet can be valuable supplementary resources for self-study. One of
the most widely acclaimed resources is the “ Kahn Academy” 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 week’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
Click here to view the video titled Correlation and
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
Click here to view the video titled ANOVA 3 -Hypothesis
Test with F-Statistic.