Question 1

Chapter 9, Section 1, Exercise 001

Use the computer output to estimate the intercept0and the slope1.

The regression equation isY=26.3+3.68X.

Predictor

Coef

SE Coef

T

P

Constant

26.261

5.672

4.63

0.000

X

3.676

0.5536

6.64

0.000

Intercept0:

Slope1:

Question 2

Chapter 9, Section 1, Exercise 002

Use the computer output to estimate the intercept0and the slope1.

The regression equation isY=801-3.76X.

Predictor

Coef

SE Coef

T

P

Constant

800.959

87.06

9.20

0.000

X

-3.757

1.232

-3.05

0.006

Intercept0:

Slope1:

Question 3

Chapter 9, Section 1, Exercise 005

Computer output for fitting a simple linear model is given below. State the value of the sample slope for the given model. In testing if the slope in the population is different from zero, identify thep-value and use it (and a5%significance level) to make a clear conclusion about the effectiveness of the model.

The regression equation isY=87.5-8.76X.

Predictor

Coef

SE Coef

T

P

Constant

87.544

4.442

19.71

0.000

X

-8.7611

1.0223

-8.57

0.000

Sample slope:

p-value:

Is the model effective?

Yes

No

Question 4

Chapter 9, Section 1, Exercise 006

Computer output for fitting a simple linear model is given below. State the value of the sample slope for this model and give the null and alternative hypotheses for testing if the slope in the population is different from zero. Identify the p-value and use it (and a 5% significance level) to make a clear conclusion about the effectiveness of the model.

The regression equation isY=81.8-0.0155X.

Predictor

Coef

SE Coef

T

P

Constant

81.77

11.73

6.97

0.000

X

-0.01548

0.01290

-1.20

0.245

Sample slope:Enter your answer; sample slope

p-value:Enter your answer; p-value

DoesXappear to be an effective predictor of the response variableY?

Choose the answer from the menu; Is the model effective?

Yes

No