Data Collection & Experimental Design Statistics

Front

What are the possible lurking (confounding) variables in a study on vitamin C reducing respiratory infections in ultramarathon runners?

Back

Age, weight, and gender of the runner

Front

What type of design was used in the study where 100 ultramarathon runners were randomly assigned to receive either vitamin C or placebo to see if it reduces respiratory infections?

Back

completely randomized

Front

What type of study was conducted to test if pleasant aromas help a student learn better?

Back

an experiment, but not double-blind

Front

What is the most important advantage of experiments over observational studies?

Back

Experiments can usually give better evidence of causation

Front

Example of dividing gym members into men and women before random assignment to groups.

Back

blocking design

Front

A market research company wishes to find out whether the population of students at a university prefers Starbucks or Dunkin Donuts. A random sample of students is selected, and each student is asked first to try both but the order they try them is randomly decided with a coin toss (heads: Starbucks, then Dunkin. tails: vice versa). They then indicate which brand they prefer. This is an example of

Back

a matched pairs experiment

Front

Why do we randomize in an experiment or a survey?

Back

It helps reduce the effects of confounding variables

Front

Identify the design for the experiment

Back

completely randomized, the treatment is pesticide

Front

What are the principles of a well-designed study?

Back

All of the above (Random Assignment, Control, Replication, Comparison)

Front

Which experimental method involves studying each and every member of the population of interest?

Back

Census