What critical t value would be needed to construct a 90% confidence interval on a sample of size 22?



1.717

1.323

2.080

1.321

1.721

To find the critical t value, we need to look up the value in the t-distribution table.

In this case, we want a 90% confidence interval, which means we want to find the critical t value that corresponds to a 95% level of confidence. The level of confidence is the complement of the significance level (α) or 1 - α.

Since we have a sample size of 22, the degrees of freedom would be (n - 1), where n is the sample size. In this case, the degrees of freedom would be (22 - 1) = 21.

Looking up in the t-distribution table for a 95% confidence level with 21 degrees of freedom, we find that the critical t value is approximately 2.080.

Therefore, the correct answer is 2.080.