Question

1. assume that during a three - hour period spent outside, a person recorded the temperature and their water consumption. the experiment was conducted on 7 randomly selected days during the summer. the data is shown in the table below.

create a scatter plot with the data. what is the correlation of this scatter plot? (hint: do not use the day on the scatter plot.)
identify the data sets as having a positive, a negative, or no correlation.

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

Explanation:

• Problem 8: As the number of hours driven increases, the number of miles driven also increases. So, there is a positive correlation.
• Problem 9: The number of siblings a student has has no relation to the grade in math class. So, there is no correlation.
• Problem 10: As the age of a car increases, its value decreases. So, there is a negative correlation.
• Problem 11: As the number of weeks a CD has been out increases, the total sales may decrease (assuming new releases take over). So, there is a negative correlation.
• Problem 12: Generally, as the number of years a person went to school increases, their income may increase. So, there is a positive correlation.
• Problem 13: As the number of songs downloaded on an iPod increases, the amount of memory available decreases. So, there is a negative correlation.
• Problem 14: The amount of time spent on the computer instant - messaging friends has no relation to the number of computers in the house. So, there is no correlation.
• Problem 15: The age of a house has no relation to the number of people living in the house. So, there is no correlation.

Answer:

• 8. Positive correlation
• 9. No correlation
• 10. Negative correlation
• 11. Negative correlation
• 12. Positive correlation
• 13. Negative correlation
• 14. No correlation
• 15. No correlation