In developing a 90% confidence interval for the expected value of y from a simple linear regression problem involving a sample of size 15, the appropriate table value would be 1.761.

Question

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For a 90% confidence interval in a simple linear regression with a sample size of 15, the degrees of freedom for the t-distribution would be 15 - 2 = 13 (subtracting 2 accounts for the two estimated parameters: the slope and the intercept). The appropriate t-table value should be looked up using 13 degrees of freedom, not directly specified as 1.761, which may not correspond to 13 degrees of freedom for a 90% confidence level.

In Developing a 90% Confidence Interval for the Expected Value