Observational study b. Designed experiment.In an observational study, researchers impose treatments and controls and then observe characteristics and take measurements.
Choose the correct answer below.
A.
In an observational study, researchers impose treatments and controls and then observe characteristics and take measurements.
B.
In an observational study, researchers simply observe characteristics and take measurements, as in a sample survey.
C.
In an observational study, researchers look at all the members of the group being studied.
Q2
Data from a sample of citizens of a certain country yielded the following estimates of average TV viewing time per month for all the citizens. The times are in hours and minutes. (NA, not available)
Viewing method May 2008 May 2007 Change (%)
Watching TV in the home 127:31 121:41 5
Watching timeshifted TV 5:48 3:46 54
Using the Internet 26:47 24:44 8
Watching video on Internet 2:14 NA NA
Is the study descriptive or inferential?
A.
Inferential, because the statistics are used to make an inference about the population
B.
Descriptive, because the statistics are used to make an inference about the population
C.
Descriptive, because the statistics are used to describe the sample
D.
Inferential, because the statistics are used to describe the sample
Q3
Is the following study descriptive or inferential?
n a statistical magazine, average professional athletes’ salaries in three sports were compiled and compared for the years 1993 and 2003.
Is the study descriptive or inferential?
A.
Inferential, because the statistics are a summary of the average salaries of professional athletes in three sports
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