# 95% confidence intervalAre middle class families more likely than working class families to maintain contact with kin? write a paragraph summarizing the results of these tests.a. A sample of 89 middle class families reported an average of 7.3 visits per year with close kin with standard deviation of 0.3 while a sample of 55 working class families averaged 8.2 visits with a standard deviation of .05. Is this difference significant?b. The middle class families averaged 2.3 phone calls (sd of .05) and 8.7 emails (sd of 0.3) per month with close kin. The working class families averaged 2.7 calls (sd of 0.8) and 5.7 emails (sd of 1.1) per month.  Are these differences significant?

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95% confidence interval

Are middle class families more likely than working class families to maintain contact with kin? write a paragraph summarizing the results of these tests.

a. A sample of 89 middle class families reported an average of 7.3 visits per year with close kin with standard deviation of 0.3 while a sample of 55 working class families averaged 8.2 visits with a standard deviation of .05. Is this difference significant?

b. The middle class families averaged 2.3 phone calls (sd of .05) and 8.7 emails (sd of 0.3) per month with close kin. The working class families averaged 2.7 calls (sd of 0.8) and 5.7 emails (sd of 1.1) per month.  Are these differences significant?

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Step 1

a)
Given data

Step 2

Here population standard deviation is unknown for the population, so we will use t-test to test the Hypothesis.
Let 1 subscript denotes middle class and 2 subscript denotes Working class
Formulation of Hypothesis
Null Hypothesis: H0: µ1 = µ2
Alternative Hypothesis: H1: µ1 > µ2

Step 3

b)

Given data for phone call...

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