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