Question

* For large samples one sample t-tests (n >120) use critical t scores of ±1.96 (for 95% confidence level two tailed test) or ±1.65 (for 95% confidence level one tailed test).

* For small samples (n<120) use critical t score obtained from t-distribution table. You will need to calculate degrees of freedom, which is simply the sample size minus 1 (df = n-1) and use an alpha value of .05.

* For comparing means between two samples (regardless of sample sizes), use an independent samples t-test, with a critical t of ±1.96.

3. Are middle-class families more likely than working class families to maintain contact with kin? Write a short 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 a standard deviation of 0.3, while a sample of 55 working-class families averaged 8.2 visits, with a standard deviation of 0.5. Is this difference significant?

B) The same sample of middle class families (n=89) averaged 8.7 emails (sd of 0.3) per month with close kin. The working-class families sample (n=55) averaged 5.7 emails (sd of 1.1) per month. Are these differences significant?

Answer 1

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