# Question

= 2.875 − 0.625x

a. Decide, at the 10% significance level, whether the data provide sufficient evidence to conclude that x is useful for predicting y.

b. Find a 90% confidence interval for the slope of the population regression line.

a. Decide, at the 10% significance level, whether the data provide sufficient evidence to conclude that x is useful for predicting y.

b. Find a 90% confidence interval for the slope of the population regression line.

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