Observational Studies and Experiments

Question 1

To determine if carrot juice helps improve heart conditions, a juicing company asks a random sample of 100 adults about whether or not they drink carrot juice and their heart condition. The company finds an association between drinking carrot juice and healthy heart conditions. Which statement is true about a possible confounding variable?

Revolt · Accepted Answer

A: A possible confounding variable is the amount of exercise. Those that drink carrot juice may be more concerned about their health and exercise more, which explains the healthy heart conditions.

Question 2

A trucking company wants to evaluate whether a decrease in the weight of their trucks helps to increase gas mileage. The company randomly selects 100 of their truck drivers, driving trucks that are identical in every way other than weight, to monitor gas mileage over a 1-year period. Results showed an association between truck weight and gas mileage. Which is a possible confounding variable for the provided scenario?

Revolt · Accepted Answer

D: The aggressiveness of the driver’s driving style

Question 3

Select all the sentences that correctly identify the components of the experiment.

Revolt · Accepted Answer

A: The experimental units are subjects.; D: There are three treatments.; E: One treatment is a circuit training class.; F: The factor is the type of class.

Question 4

✔ observational studyexperiment

Revolt · Accepted Answer

A: ✔ observational study

Question 5

observational study ✔ experiment

Revolt · Accepted Answer

B: ✔ experiment

Question 6

✔ retrospectiveprospective

Revolt · Accepted Answer

A: ✔ retrospective

Question 7

Complete the sentences to accurately describe the situation.

Revolt · Accepted Answer

There are treatments, and they are the .: three; There are treatments, and they are the .: options for ACL reconstruction; The experimental units are the .: 60 people in the study; Since the experimental units human beings, they are called .: are; Since the experimental units human beings, they are called .: subjects

Question 8

What are the factor(s) and level(s) of this scenario?

Revolt · Accepted Answer

The factor is the .: sleep medication; The levels are the .: 4 different treatments, or medications

Question 9

What are the factor(s) and level(s) of this scenario?

Revolt · Accepted Answer

A: ✔ sleep medication

Question 10

6 weeks of the experiment✔ 4 different treatments, or medications20 subjects in each group

Revolt · Accepted Answer

B: ✔ 4 different treatments, or medications

Observational Studies and Experiments Answers

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Observational Studies and Experiments Answers

More from this Course

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