Question: When constructing a paired t interval based on a random sample of 9 pairs, what is the critical value t* for an 80% confidence interval?

When constructing a paired t interval based on a random sample

When constructing a paired t interval based on a random sample of 9 pairs, what is the critical value t* for an 80% confidence interval? 0.9 1.282 1.397 1.415 O 1.860

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