sarahhymas sarahhymas

16-06-2018
Chemistry

contestada

20 POINTS!
The CDC (Centers for Disease Control) is a federal agency that monitors the spreading of various diseases and health issues. They have done extensive research on the effects of tobacco on a person's health.

The CDC does a study on smoking with the hypothesis, "If a person smokes more cigarrettes, then they are more likely to develop heart disease". Which of the following should be a controlled variable for this experiment? Choose all that apply.

1. Amount of smoking a person does
2. weight class of the person
3. state where the person lives
4. Whether or not the person develops heart disease

Respuesta :

erber123 erber123

16-06-2018

The correct options would be

OPTIONS 1 & 2

The state which a person lives in has nothing to do with the experiment, although it would most likely make it easier to observe. Wheter they develop heart disease or not is the results of the experiment.

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