AP Statistics Test 11/26
1) subjects assigned randomly to treatments 2) a control group or at least 2 treatment groups 3) replication
A well designed experiment should have
Bechhofer, Taylor, Weiss (Choice C)
Answer to #2
Matched pairs design
Coffee question
Control the effects of outside variables on the outcome
Control groups are used in experiments in order to
E) The two cuts that are being roasted for each time-temperature combination is an example of replication
Lamb question
C) Mail surveys to 1,000 subs randomly selected from all subs
Magazine question
213-5764
Matching section (each council member on top, Board of Edu on bottom)
D: An observational study was conducted, and the response variable is the concentration of the chemical
Question about chemicals in river water
C) Experiment only applied to green beans, so results can not be generalized to all vegetables
Question about green beans seedlings
Undercoverage
Question about the election answer
Less chance of bias in data as in method 1 more people may respond but the data will be very skewed as people who make less who will be less likely to share their income
Reunion Question B
The median would be less skewed by extreme values than the mean would
Reunion question A
The placebo effect
The condition when subjects in both the treatment and control group exhibit favorable responses
Census
a sample that consists of the entire population