Quiz about 11/18 Observational v Experimental Studies

Question 1

What is the difference between an observational study and an experiment?

Accepted Answer

Experiments involve imposing a treatment.

Answer

Observational studies compare data.

Answer

Observational studies have subjects and treatments.

Question 2

A park ranger measures the change in height of all trees of a similar species and age over a month. Half of the trees are within a quarter of a mile from a large lake and half are further away. Is this an observational or experimental study?

Accepted Answer

observational

Answer

experimental

Question 3

A park ranger plants 10 trees within a quarter of a mile from a large lake and 10 trees of a similar species and age further than half of a mile from the lake. He then measures the growth of all trees over a month. Is this an experimental or observational study?

Accepted Answer

experimental

Answer

observational

Question 4

A zoo installs small "caves" in half of the wildcat cages. The caves provide shade and privacy for the animals and are just large enough to hold a wildcat that is lying down. The caretaker at the zoo then compares the sleeping habits of wildcats with "caves" in their cages to the sleeping habits of wildcats without them. Is this an observational or experimental study?

Accepted Answer

experimental

Answer

observational

Question 5

A caretaker at a zoo records the sleeping habits of the wildcats at the zoo for a month. Is this an experimental or observational study?

Accepted Answer

observational

Answer

experimental

Question 6

A researcher feeds one group of rats high-fat and high-calorie foods like cheesecake, bacon, and pastries. She feeds a second group of rats a normal, nutritious diet. For two weeks, the researcher records how many calories each rat eats daily, as well as how often it goes to its feeding bowl. She compares data from the one group to the data from the other and finds that the rats that eat the nutritious food get hungry less often and eat a smaller number of calories overall. What is the TREATMENT in this experiment?

Accepted Answer

food given to the rats

Answer

fatty foods

Answer

nutritious foods

Question 7

Should this research topic be addressed through an experimental study or an observational study, and why: "Does being a smoker cause people to get colds more often?"

Accepted Answer

observational study, prevents being unethical

Answer

observational study, increases chances of being unethical

Answer

experimental study, increases chances of being unethical

Answer

experimental study, prevents being unethical

Question 8

To test the effects of breakfast on grades I ask my students if they ate breakfast and then compare the breakfast eaters grades to the non-breakfast eaters.
This is an example of:

Accepted Answer

Observational study

Answer

Experiment

Answer

Neither

Answer

Both observational study and experiment

Question 9

To test the effects of eating breakfast on test grades. I randomly select half of my students and feed them breakfast while giving the other half nothing to eat. I then give them a test and compare the grades of each group.

What are the experimental units in this study?

Is this an experiment or an observational study?

Accepted Answer

Experiment

Answer

Observational study

Answer

Neither

Answer

Both experiment and observational study.

Question 10

To test the effects of eating breakfast on test grades. I randomly select half of my students and feed them breakfast while giving the other half nothing to eat. I then give them a test and compare the grades of each group.

What are the experimental units in this study?

Accepted Answer

Students

Answer

Breakfast

Answer

Tests

Answer

Test grades

Question 11

The most important advantage of experiments over observational studies is that...

Accepted Answer

experiments can give better evidence of causation.

Answer

experiments are usually easier to carry out than observational studies.

Answer

confounding cannot happen in experiments.

Answer

an observational study cannot have a response variable.

Question 12

To ensure that the experiment results are valid it is important that the experiment be...

Accepted Answer

All of the above

Answer

Replicated

Answer

Controlled

Answer

Randomized

Question 13

Jane Goodall lived among wild chimpanzees intermittently for decades, studying their social and family systems while keeping her interaction with the chimpanzees to a minimum. Her research method can most accurately be described as a...

Accepted Answer

observation

Answer

survey

Answer

case study

Answer

experiment

Question 14

Dr. Larson was interested in whether classical music helps students perform better on a test. Dr. Larson randomly assigned half of the study's participants to a group that listened to classical music while taking a test. The other half of the participants did not listen to music while taking a test. The research design Dr. Larson used is...

Accepted Answer

an experiment

Answer

a case study

Answer

an observation

Answer

a survey

Question 15

A researcher randomly assigned boys and girls to each of two groups. One group was assigned to watch a violent television program while the other group watched a nonviolent program. The children's behavior was then recorded for incidences of aggressive behavior. This research method is best characterized as...

Accepted Answer

experimental

Answer

case study

Answer

correlational

Answer

observation

11/18 Observational v Experimental Studies

15 questions

What is the difference between an observational study and an experiment?

A park ranger measures the change in height of all trees of a similar species and age over a month. Half of the trees are within a quarter of a mile from a large lake and half are further away. Is this an observational or experimental study?

A park ranger plants 10 trees within a quarter of a mile from a large lake and 10 trees of a similar species and age further than half of a mile from the lake. He then measures the growth of all trees over a month. Is this an experimental or observational study?

A caretaker at a zoo records the sleeping habits of the wildcats at the zoo for a month. Is this an experimental or observational study?

Should this research topic be addressed through an experimental study or an observational study, and why: "Does being a smoker cause people to get colds more often?"

To test the effects of breakfast on grades I ask my students if they ate breakfast and then compare the breakfast eaters grades to the non-breakfast eaters.
This is an example of:

To test the effects of eating breakfast on test grades. I randomly select half of my students and feed them breakfast while giving the other half nothing to eat. I then give them all a test and compare the test grades of each group.
Is this an experiment or an observational study?

To test the effects of eating breakfast on test grades. I randomly select half of my students and feed them breakfast while giving the other half nothing to eat. I then give them a test and compare the grades of each group.

What are the experimental units in this study?

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11/18 Observational v Experimental Studies

15 questions

What is the difference between an observational study and an experiment?

A park ranger measures the change in height of all trees of a similar species and age over a month. Half of the trees are within a quarter of a mile from a large lake and half are further away. Is this an observational or experimental study?

A park ranger plants 10 trees within a quarter of a mile from a large lake and 10 trees of a similar species and age further than half of a mile from the lake. He then measures the growth of all trees over a month. Is this an experimental or observational study?

A caretaker at a zoo records the sleeping habits of the wildcats at the zoo for a month. Is this an experimental or observational study?

Should this research topic be addressed through an experimental study or an observational study, and why: "Does being a smoker cause people to get colds more often?"

To test the effects of breakfast on grades I ask my students if they ate breakfast and then compare the breakfast eaters grades to the non-breakfast eaters.This is an example of:

To test the effects of eating breakfast on test grades. I randomly select half of my students and feed them breakfast while giving the other half nothing to eat. I then give them all a test and compare the test grades of each group.Is this an experiment or an observational study?

To test the effects of eating breakfast on test grades. I randomly select half of my students and feed them breakfast while giving the other half nothing to eat. I then give them a test and compare the grades of each group. What are the experimental units in this study?

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Mathematics

To test the effects of breakfast on grades I ask my students if they ate breakfast and then compare the breakfast eaters grades to the non-breakfast eaters.
This is an example of:

To test the effects of eating breakfast on test grades. I randomly select half of my students and feed them breakfast while giving the other half nothing to eat. I then give them all a test and compare the test grades of each group.
Is this an experiment or an observational study?

To test the effects of eating breakfast on test grades. I randomly select half of my students and feed them breakfast while giving the other half nothing to eat. I then give them a test and compare the grades of each group.

What are the experimental units in this study?