8 terms

Statistics: Biased and Unbiased, type of sampling

STUDY
PLAY
Ask 10 people at random. Biased or unbiased? Type of sample?
Unbiased. Simple, random sample.
Stands at the entrance to school
and asks every 10th seventh
grader to enter. Biased or unbiased? Type of sample?
Unbiased. Simple, systematic random sample.
Asks every student to fill out a
survey and drop it off at the 7th
grade office on the way out of
school. Biased or unbiased? Type of sample?
Biased. Voluntary sample.
Asks students in Ms. D's class to fill out a survey. Biased or unbiased? Type of sample?
Biased. Convenience sample.
Asks 100 people at random during the last 7th grade assembly. Biased or unbiased? Type of sample?
Unbiased. Simple, random sample.
To determine the popularity of a political candidate, 5 people are randomly polled from different age groups of eligible voters. Biased or unbiased? Type of sample?
Unbiased. Simple random sample.
Of the 2000 watches made, the manufacturer tests the first 15 watches produced for defects. Of the watches, 3 were defective. Biased or unbiased? Type of sample?
Biased. Convenience sample.
From a batch of 7500 computer chips produced, the manufacturer sampled every 150th chip at random for defects and found that 2 were defective. Biased or unbiased? Type of sample?
Unbiased. Systematic random sample.