In the regression equation -5.23 2.74x and n-24, the mean of x is 1256, 55-55.87 and 5-1071. A 90% confidence interval for y when x-11 is, O (2.74,523) O (16.21, 54.531 (30.00,40.74) O (35.37, 70.741 O [12.56, 55.87)

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