Practice- Independent and Dependent Variables



Name__________________________________________________Period 1 2 3 4 5

Practice- Independent and Dependent Variables

Sample Problem: Dr. Hank has recently moved to the Hamptons with his brother Evan. After two weeks everyone is getting sick from Streptococcal pharyngitis (strep throat). As each day passes, he treats more patients. The different number of people infected is increasing. Hank wants to find out where Streptococcal pharyngitis is coming from. He sends his brother Evan out to test every water fountain in town. Evan discovered that the water fountain at the Wal-Mart is the source of the Streptococcal pharyngitis.

a. What is his Independent variable? _______________________________________

b. What will be his Dependent variable? ____________________________________

Directions

1. Mary studies the effect of Albuquerque's heat on the number of criminals she arrests. She records the temperature in her car every time she arrests someone for 2 weeks. She discovers that the heat in Albuquerque has no relationship to how many people are arrested.

a. Independent variable: ________________________________________________

b. Dependent variable: _________________________________________________

2. Annie Walker works at the Smithsonian in Washington DC. She thinks that more people come to the Smithsonian when the Washington Nationals (a major League baseball) are playing out of town. For May-August, she records the attendance at the Smithsonian both when the Nationals have home games and when they are away. Her experiment showed that she was correct more people came to the museum when there wasn’t a baseball game that day.

a. Independent variable: ________________________________________________

b. Dependent variable: _________________________________________________

3. Shawn promises his psychic powers come from light absorption. Gus studies the light absorption pigments in the pysch office when a client comes in. Gus measured the amount of red, blue, green, and yellow light in the room while Shawn.

a. Independent variable: ________________________________________________

b. Dependent variable: _________________________________________________

4. Dr. Colley hypothesizes that the adult weight of a dog is greater if it had fewer littermates (# of brothers and sisters). He studies 20 different black labs giving each one the same kind of dog food at the same time each day. He records the weight of each dog for 6 months.

a. Independent variable: ________________________________________________

b. Dependent variable: _________________________________________________

c. Constant variable ___________________________________________________

Name________________________________________________Period 1 2 3 4 5

Practice- Independent and Dependent Variables

Complete the following table by writing possible independent or dependent variables.

|Independent Variable |Dependent Variable |

|Number of hours you study for a test |Your test score |

|Number of gallons in your gas tank | |

| |Cost of your pizza |

|Number of text messages received | |

| |Time it takes to clean up your room |

Refer to the following graph for questions 5-7.

5. What is the independent variable?

6. What is the dependent variable?

7. How are the independent and dependent variables related? (Be as precise as you can)

You are given the following data on the relationship between John’s test score and the number of hours he studies.

8. What are the independent and dependent variables?

9. How are the independent and dependent variables related? (Be as precise as you can)

You are given the following data on the relationship between the number of dinner guests at

Mary’s house and the amount of time she will need to prepare dinner

10. What are the independent and dependent variables?

11. How are the independent and dependent variables related? (Be as precise as you can)

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