Question

directions: identify the relationships below as having a positive, negative, or no correlation.
remember positive correlation is when both increases while negative correlation is when the
explanatory variable increases and the response variable decreases.

1. the number of hours a person has driven and the number of miles driven.
2. the number of siblings a student has and the grade they have in math class.
3. the age of a car and the value of the car.
4. the number of weeks a cd has been out and the total sales.
5. the number of years a person went to school and their income.
6. the number of songs downloaded on your i - pod and the amount of memory available.
7. the amount of time spent on the computer instant messaging your friends and the

number of computers in your house.

1. the age of a house and the number of people living in the house.

Explanation:

• 9: As a person drives more hours, the number of miles driven increases. So, there is a positive correlation.
• 10: The number of siblings a student has and their grade in math class are not related. So, there is no correlation.
• 11: As a car gets older (age increases), its value decreases. So, there is a negative correlation.
• 12: As a CD is out for more weeks, total sales do not follow a simple increasing - decreasing trend. There is no correlation.
• 13: As a person goes to school for more years, their income generally increases. So, there is a positive correlation.
• 14: As more memory is available on an iPod, more songs can be downloaded. So, there is a positive correlation.
• 15: The amount of time spent on computer instant - messaging and the number of computers in the house are not related. So, there is no correlation.
• 16: The age of a house and the number of people living in it are not related. So, there is no correlation.

Answer:

1. Positive correlation
2. No correlation
3. Negative correlation
4. No correlation
5. Positive correlation
6. Positive correlation
7. No correlation
8. No correlation