experimental design
Post on 21-May-2015
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Study Session
Experimental Design
Experimental Design
1. Which of the following is true regarding the difference between an observational study and and an experiment?a) An experiment must have a control group whereas the observational study does not.b) An observational study is used for human subjects whereas an experiment is used for non-human subjects.c) In an experiment, the investigator randomly places
subjects into treatment and control groups whereas in an observational study, the subjects are placed into groups based on a characteristic.d) The observational study can produce causal results
whereas an experiment can only identify an association.e) None of these is true.
Experimental Design
Which of the following is true regarding the difference between an observational study and and an experiment?
c) In an experiment, the investigator randomly places subjects into treatment and control groups whereas in an observational study, the subjects are placed into groups based on a characteristic.
Experimental Design
What are the three principles of experimental design?
Experimental Design
What are the three principles of experimental design?
RandomizationControlReplication
Experimental Design
3. In an experiment, if two variable are confounded, which of the following statements is true?
a) One of the variables must be a lurking variable.
b) There is a clear indication that a placebo effect is present in the experiment.
c) The investigator cannot separate the effect of the variables on a response variable.
d) None of these is true.
Experimental Design
In an experiment, if two variable are confounded, which of the following statements is true?
c) The investigator cannot separate the effect of the variables on a response variable.
Experimental Design
Which one of the following statements about experiments is true?a) All experiments must have a control group.b) Blocking is employed to reduce variation.c) Random assignment is only critical for treatment groups, as opposed to control groups.d) Matching can be used in any experiment to eliminate lurking variables.e) None of these is true.
Experimental Design
Which one of the following statements about experiments is true?
b) Blocking is employed to reduce variation.
Experimental Design
A randomized block design is similar to which of the following sampling designs?
a) simple random sampleb) multi-stage cluster samplec) stratified sampled) convenience samplee) systematic sample
Experimental Design
A randomized block design is similar to which
of the following sampling designs?
c) stratified sample
Experimental Design
Blocking is utilized to helpa) organize the treatment and control groups b) counteract the placebo effect.c) produce groups that are as similar as
possible.d) avoid the need for randomization.e) replicate the experiment within each
block
Experimental Design
Blocking is utilized to help
c) produce groups that are as similar as possible.
Experimental Design
A randomized block design is NOTa) similar to a stratified random sample for surveysb) a strategy to control for an influence that would
affect the outcome of the experiment.,c) a strategy that depends on randomization.d) only used for gender comparisonse) All of these describe a randomized block design.
Experimental Design
A randomized block design is NOT
d) only used for gender comparisons
Experimental Design
A medical researcher is interested in testing a newmedicine for migraine headaches. She decides toconduct a clinical trial on 100 randomly selectedadults who get migraine headaches at a rate of oneper week or more. Although age and gender are notof primary interest in the trials, the researcher isconcerned that these factors may impact theeffectiveness of the drug. Describe how she should set up her experiment for the 100 subjects without considerations of age and gender. A graphic is an acceptable answer.
Experimental Design
Describe how she should set up her experiment for the 100 subjects without considerations of age and gender. A graphic is an acceptable answer.
Randomize
50 adults new drug
50 adults old drug
Measure and compare number of headaches
Experimental Design
A medical researcher is interested in testing a newmedicine for migraine headaches. She decides toconduct a clinical trial on 100 randomly selectedadults who get migraine headaches at a rate of oneper week or more. Although age and gender are notof primary interest in the trials, the researcher isconcerned that these factors may impact theeffectiveness of the drug. Describe how she should set up her experiment for the 100 subjects if she wishes to control for gender.
Experimental Design
Describe how she should set up her experiment for
the 100 subjects if she wishes to control for gender.
-It is believed that males and females will respond differently to the drug, so we block by gender.
Male
Female
New drug
Old drug
New drug
New drug
Measure number of headaches & compare
Measure number of headaches & compare
Barron’s Problems
P. 369 #12, 18, 25, 33, 34
P. 377 #3
P. 430 #1
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