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Chapter 13 Exercise 6

The owner of Maumee Ford-Mercury-Volvo wants to study the relationship between the age of a car and its selling price. Listed below is a random sample of 12 used cars sold at the dealership during the last year.

Car Age (years) Selling Car Age (years) Selling Price ($000)

Price ($000)

1 9 8.1 7 8 7.6

2 7 6.0 8 11 8.0

3 11 3.6 9 10 8.0

4 12 4.0 10 12 6.0

5 8 5.0 11 6 8.6

6 7 10.0 12 6 8.0

a. If we want to estimate selling price on the basis of the age of the car, which variable is the dependent variable and which is the independent variable?

b-1. Determine the correlation coefficient. (Negative amounts should be indicated by a minus sign. Round your answers to 3 decimal places.)

b-2. Determine the coefficient of determination. (Round your answer to 3 decimal places.)

c. Interpret the correlation coefficient. Does it surprise you that the correlation coefficient is negative? (Round your answer to nearest whole number.)

Want to see the Individual Assessment of Week 5..?? Click QNT 561 Week 5 Weekly Learning Assessments

Chapter 13 Exercise 12

The Student Government Association at Middle Carolina University wanted to demonstrate the relationship between the number of beers a student drinks and his or her blood alcohol content (BAC). A random sample of 18 students participated in a study in which each participating student was randomly assigned a number of 12-ounce cans of beer to drink. Thirty minutes after they consumed their assigned number of beers, a member of the local sheriff’s office measured their blood alcohol content. The sample information is reported below.

Student Beers BAC Student Beers BAC

1 6 0.1 10 3 0.07

2 7 0.09 11 3 0.05

3 7 0.09 12 7 0.08

4 4 0.1 13 1 0.04

5 5 0.1 14 4 0.07

6 3 0.07 15 2 0.06

7 3 0.1 16 7 0.12

8 6 0.12 17 2 0.05

9 6 0.09 18 1 0.02

Use a statistical software...

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