Question

practice it!

during the fall semester at school, you notice that you do not hear as many crickets chirping as you remember during the summer months.

you decide to investigate and conduct an experiment to find the reason.

you begin with the question, \how does temperature affect how often crickets chirp?\

based on your current observations and background knowledge, you create the hypothesis \if the temperature is warm, then the crickets will chirp more often.\

select the statement(s) that describe appropriate variables for the investigation above.

□ the test variable is the number of cricket chirps per minute.
□ the outcome variable is the temperature of the room.
□ the test variable is the season of the year.
□ the outcome variable is the number of cricket chirps per minute.
□ the test variable is the temperature of the room.

Explanation:

To determine the correct statements about variables, we recall: The test (independent) variable is what's manipulated (here, temperature), and the outcome (dependent) variable is what's measured (number of cricket chirps per minute).

• "The test variable is the number of cricket chirps per minute" is wrong (it's the outcome).
• "The outcome variable is the temperature of the room" is wrong (temperature is test).
• "The test variable is the season of the year" is wrong (test is temperature, not season).
• "The outcome variable is the number of cricket chirps per minute" is correct (it's what's measured based on temperature).
• "The test variable is the temperature of the room" is correct (it's manipulated to see its effect on chirps).

Answer:

• The outcome variable is the number of cricket chirps per minute
• The test variable is the temperature of the room