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a. What is the generic definition of degrees of freedom (df)?

b. Under what situations are degrees of freedom (df) calculated?

c. Why is there a table of critical values for the t-statistic rather than a single critical value?

d. What information is needed to identify the critical value for the t-statistic?

 e. Under what situations would you conduct the z-test for one mean or the t-test for one mean?

 f. What are the differences between the formulas for the population standard error of the mean and the standard error of the mean?

g. What are the similarities and differences between the formulas for the z-test and the t-test?

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