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Regression Equation

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34. In a manufacturing process a random sample of 9 bolts manufactured has a mean length of 3 inches with a variance of 0.09. What is the 90% confidence interval for the true mean length of the bolt?
A) 2.8355 to 3.1645 inches
B) 2.5065 to 3.4935 inches
C) 2.4420 to 3.5580 inches
D) 2.8140 to 3.8160 inches
E) 2.9442 to 3.0558 inches

Use the following to answer questions 7 - 9:

The following results were obtained from a simple regression analysis:

= 37.2895 - (1.2024)X
r2 = 0.6744 sb = 0.2934

7. For each unit change in X (independent variable), the estimated change in Y (dependent variable) is equal to:
A) -1.2024
B) 0.6774
C) 37.2895
D) 0.2934

8. When X (independent variable) is equal to zero, the estimated value of Y (dependent variable) is equal to:
A) -1.2024
B) 0.6774
C) 37.2895
D) 0.2934

9. ____________ is the proportion of the variation explained by the simple linear regression model:
A) -1.2024
B) 0.6774
C) 37.2895
D) 0.2934

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The solution contains explanation to certain multiple choice questions from Regression analysis

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