-What method of data collection would you use to collect data for a study where
ID: 3049726 • Letter: #
Question
-What method of data collection would you use to collect data for a study where a drug was given to 40 patients and a placebo to another group of 40 patients to determine if the drug has an effect on a patient's illnes?
observational study
survey
published source
designed experiment
- A pollster uses a computer to generate 500 random numbers, then interviews the voters corresponding to those numbers.
systematic
convenience
stratified
cluster
random
-A watchdog group is investigating how people are treated during the foreclosure process. surveys were mailed to a random sample of 300 people who had recently been threatened with foreclosure. 75 of the surveys were returned by the surveys were returned by the postal service because the intended recipients had moved and left no forwarding address. What type of problem has occurred?
measurement error
selection bias
nonresponse bias
Explanation / Answer
What method of data collection would you use to collect data for a study where a drug was given to 40 patients and a placebo to another group of 40 patients to determine if the drug has an effect on a patient's illnes?
Answer : observational study (observational study draws inferences from a sample to a population where the independent variable is not under the control of the researcher)
- A pollster uses a computer to generate 500 random numbers, then interviews the voters corresponding to those numbers.
Answer : Random (since the population is selected randomly from a computer)
-A watchdog group is investigating how people are treated during the foreclosure process. surveys were mailed to a random sample of 300 people who had recently been threatened with foreclosure. 75 of the surveys were returned by the surveys were returned by the postal service because the intended recipients had moved and left no forwarding address. What type of problem has occurred?
Answer : nonresponse bias
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