Vaccine responses have been observed for 1,859 people. Find the critical t value to use for each

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Vaccine responses have been observed for 1,859 people. Find the critical t value to use for each of the following confidence interval calculations: 

a. Two-sided 95% confidence. 

b. Two-sided 99% confidence. 

c. Two-sided 99.9% confidence. 

d. Two-sided 90% confidence.

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