Question

1. how do constants help in scientific experiments? a. they make the experiment more complicated b. they allow for multiple variables to be tested at once c. they ensure that changes in the dependent variable are due to the independent variable d. they replace the need for an independent variable 8. in a study about the effect of exercise on heart rate, what would be the dependent variable? a. the types of exercises performed b. the duration of the exercise c. the participants heart rate d. the time of day the exercise is done 9. which statement best describes the relationship between variables in an experiment? a. the independent variable affects the dependent variable b. the dependent variable affects the independent variable c. constants affect both independent and dependent variables d. there is no relationship between variables in an experiment 10. in an experiment studying how different music genres affect study concentration, what would be a good constant? a. the volume of the music b. the genre of music played c. the difficulty of study material d. the concentration level of students

Explanation:

1. Constants in scientific experiments are used to control variables so that changes in the dependent variable can be attributed to the independent variable.
2. In a study on the effect of exercise on heart rate, the heart - rate is what is being measured and is affected by the exercise, so it is the dependent variable.
3. In an experiment, the independent variable is the one that is manipulated and it affects the dependent variable.
4. When studying how music genres affect study concentration, keeping the difficulty of the study material constant helps isolate the effect of the music genre.

Answer:

1. c. They ensure that changes in the dependent variable are due to the independent variable
2. c. The participant's heart rate
3. a. The independent variable affects the dependent variable
4. c. The difficulty of study material