Calculate degrees of freedom and identify the critical t value for a single-sample t test in each

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Calculate degrees of freedom and identify the critical t value for a single-sample t test in each of the following circumstances:

a. Two-tailed test, N = 8, p level of 0.10

b. One-tailed test, N = 42, p level of 0.05

c. Two-tailed test, N = 89, p level of 0.01

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