Question

exercises with dependent and independent variables
remember—
the independent variable is what is controlled in the experiment.
the dependent variable is what is measured in the experiment.
identify the dependent and independent variables in the following cases.

1. athletes who do not get enough sleep the night before will not run as fast the next day.

independent variable:
dependent variable:

1. researchers want to know if the gas mileage of cars will increase with a new type of asphalt surface on roads.

independent variable:
dependent variable:

1. the amount of rainfall in an area affects the incidence of wildfires.

independent variable:
dependent variable:

1. covering a scrape with a band - aid decreases healing time.

independent variable:
dependent variable:

1. people with an income greater than $50,000 spend more money on eating out than people who make less than $30,000.

independent variable:
dependent variable:
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Explanation:

1. The amount of sleep affects running speed. So sleep amount is independent and running speed is dependent.
2. The type of asphalt surface may impact gas mileage. Asphalt surface type is independent and gas mileage is dependent.
3. Rainfall amount influences wild - fire incidence. Rainfall amount is independent and wild - fire incidence is dependent.
4. Using a band - aid affects healing time. Band - aid usage is independent and healing time is dependent.
5. Income level affects money spent on eating out. Income level is independent and money spent on eating out is dependent.

Answer:

1. Independent variable: Amount of sleep the night before

Dependent variable: Running speed the next day

1. Independent variable: Type of asphalt surface on roads

Dependent variable: Gas mileage of cars

1. Independent variable: Amount of rainfall in an area

Dependent variable: Incidence of wildfires

1. Independent variable: Use of a band - aid to cover a scrape

Dependent variable: Healing time

1. Independent variable: Income level

Dependent variable: Money spent on eating out