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- 1. Multiple Choice
A scientist hypothesizes the the temperature at which an alligator's egg is incubated will determine whether the alligator will be male or female. The explanatory (independent) variable is
the male alligators
the incubator
the gender of the alligator
the temperature
- 2. Multiple Choice
A scientist hypothesizes the the temperature at which an alligator's egg is incubated will determine whether the alligator will be male or female. The response (dependent) variable is
the size of the baby alligators
the gender of the baby alligators
the incubator
the temperature
- 3. Multiple Choice
Students used various temperatures of water to see which one dissolved candy faster.
What was the explanatory variable?
Amount of Candy
Amount of Water
Temperature of Water
Time for Candy to Dissolve
- 4. Multiple Choice
Students wanted to see if the type of material affected the temperature after being placed under a heat lamp for 10 minutes.
What is the response variable for this investigation?
Type of material (rocks, sand etc)
Temperature after 10 minutes
Time under the lamp
Heat lamp, amount of material
- 5. Multiple ChoiceCorn variety #1 yielded 140 bushels per acre last year at a research farm. This year, corn variety #2, planted in the same location, yielded only 110 bushels per acre. Unfortunately, we don't know whether the difference is due to the superiority of variety #1 or to the effect of this year's drought. This is an example of...random sampling error.nonsampling error.confounding.the placebo effect.
- 6. Multiple Choice
A study compares the effect on college students of two different TV advertisements for spring break in Gulf Shores, Alabama. Call the ads "Ad #1" and "Ad #2". We want to know which ad makes more students want to visit Gulf Shores during spring break. The subjects are 90 students taking a course in hotel management. The design of the study looks like the picture above.
What is the statistical name for this study design?
Observational study
simple random sample.
randomized comparative experiment.
matched-pairs experiment.
- 7. Multiple ChoiceA study compares the effect on college students of two different TV advertisements for spring break in Gulf Shores, Alabama. Call the ads "Ad #1" and "Ad #2". We want to know which ad makes more students want to visit Gulf Shores during spring break. The subjects are 90 students taking a course in hotel management. The design of the study looks like the picture above.
The method used to form the groups appears in the diagram at the point marked "Question A". This method is...Men in Group 1, Women in Group 2Students chose which group they want.Voluntary assignmentRandom assignment. - 8. Multiple ChoiceA study compares the effect on college students of two different TV advertisements for spring break in Gulf Shores, Alabama. Call the ads "Ad #1" and "Ad #2". We want to know which ad makes more students want to visit Gulf Shores during spring break. The subjects are 90 students taking a course in hotel management. The design of the study looks like the picture above.
What is Group 2's treatment (at the point marked "Question B)?a placeboAd #2One of the ads, chosen at random.Watch TV but see no advertisement - 9. Multiple ChoiceA study compares the effect on college students of two different TV advertisements for spring break in Gulf Shores, Alabama. Call the ads "Ad #1" and "Ad #2". We want to know which ad makes more students want to visit Gulf Shores during spring break. The subjects are 90 students taking a course in hotel management. The design of the study looks like the picture above.
The response variable should be named in the outline at (Question C). The response variable in this study is...whether a student wants to visit Gulf Shores.which advertisement a student watched.90 college students.Ad #2 - 10. Multiple ChoiceThe most important advantage of experiments over observational studies is that...experiments are usually easier to carry out than observational studies.experiments can give better evidence of causation.confounding cannot happen in experiments.an observational study cannot have a response variable.
- 11. Multiple Choice
Two variables in a study are said to be confounding if...
you cannot separate their effects on the response variable
they are highly correlated
one of them is a placebo
one of them is a control
- 12. Multiple ChoiceTo ensure that the experiment results are valid it is important that the experiment be...ReplicatedControlledRandomizedAll of the above
- 13. Multiple ChoiceThe process of repeating an experiment under the same of similar conditions is called...ReplicationRandomizationControlTreatment
- 14. Multiple ChoiceThe process of making sure there are no outside factors that are affecting the outcomes of the experiment is called...ReplicationControlTreatmentRandomization
- 15. Multiple ChoiceA situation that occurs when an experimenter cannot tell the difference between the effects of the different factors on a variableHawthorne EffectConfounding VariablePlacebo Effect
- 16. Multiple ChoiceWhich is important in designing a good experiment?
1. Randomization in assigning subjects to treatments
2. Control of potentially confounding variablese
3. Replication of the experiment on a sufficient number of subjects1 and 21 and 32 and 3All 3 - 17. Multiple ChoiceWhat is the control group?amount of time the spray stays on the showerthe half of the shower sprayed with waterthe half of the shower sprayed with coconut juicethe amount of slime
- 18. Multiple ChoiceWhat is the experimental group?drink type# of paper stacksGroup BGroup A
- 19. Multiple ChoiceTo 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:Observational studyExperimentNeitherBoth observational study and experiment - 20. Multiple Choice
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?
Experiment
Observational study
Neither
Both experiment and observational study.
- 21. Multiple ChoiceTo 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?StudentsBreakfastTestsTest grades - 22. Multiple ChoiceTo 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. What is the control for this experiment?The students who did not get any breakfast from me.The students who pass the test.The tests.There was no control
- 23. Multiple ChoiceTo 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.
Who or what are treatments?All the studentsOnly the students who got breakfastOnly the students who did not get breakfastThe breakfast - 24. Multiple Choice
Participants first do an IQ test. They are then paired with someone who has the same IQ as them. One person from the pair is in the control group, the other in the experimental.
What type of experimental design is this?
Independent Groups
Repeated Measures
Blocking into groups
Matched Participants
- 25. Multiple Choice"Spending time with a pet reduces stress" The independent variable would be...Stress LevelsSearching PetfinderAmount of time with a petScores on a test
- Answer choicesTagsAnswer choicesTags