AP Stats Quiz 4.1

Quiz > AP Stats Quiz 4.1 - 4.2

Vacaville Christian Schools MATHEMATICS STATS1 Multple Choice Questons Directon: Read the questons carefully and circle your fnal answers. (2 pts each) 1. Each person in a simple random sample of 2,000 received a survey, and 317 people returned their survey. How could nonresponse cause the results of the survey to be biased? a. Those who did respond may diﬀer in som ...[Show More]

Vacaville Christian Schools
MATHEMATICS STATS1
Multple Choice Questons
Directon: Read the questons carefully and circle your fnal answers. (2 pts each)
1. Each person in a simple random sample of 2,000 received a survey, and 317 people returned their survey. How
could nonresponse cause the results of the survey to be biased?
a. Those who did respond may diﬀer in some important way from those who did not respond.
b. Those who did not respond were indistnguishable from those who did not receive the survey.
c. Those who did not respond reduced the sample size, and small samples have more bias than large samples.
d. Those who did not respond caused a violaton of the assumpton of independence.
2. A pharmaceutcal company manufactures medicine to reduce pain caused by migraine headaches. The company
is investgatng whether a new medicine is more eﬀectve in reducing pain than the current medicine. A random
sample of 500 partcipants who experience migraines was selected, and the partcipants were randomly assigned
to one of two groups of equal size. The frst group received the current medicine and the second group received
the new medicine. When a partcipant experienced a migraine, he or she was instructed to take the medicine and,
15 minutes afer taking the medicine, to rate the pain relief on a scale from 1 to 10, with 1 being no relief to 10
being complete relief. At the end of six months, the average pain relief for each partcipant was calculated. Which
of the following is the best descripton of the study?
a. An experiment using a matched-pair design.
b. An experiment using a completely randomized design.
c. An observatonal study using a cluster sample.
d. An observatonal study using a stratfed sample.
3. Under which of the following conditons is it preferable to use stratfed random sampling rather than simple
random sampling?
a. The populaton can be divided into strata of equal sizes so that each individual in the populaton stll has the
same chance of being selected.
b. The populaton can be divided into a small number of strata so that each stratum contains a large number of
individuals.