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Test 9B
A P Statistics
Name:
Directions:
Work on these sheets.
Answer completely, but be concise.
Part 1:
Multiple Choice.
Circle the letter corresponding to the best answer.
1.
A phonein poll conducted by a newspaper reported that 73% of those who called in liked business
tycoon Donald Trump.
The unknown true percentage of American citizens who like Donald
Trump is a
(a) Statistic
(b) Sample
(c) Parameter
(d) Population
(e) None of the above.
The answer is
.
2.
The sampling distribution of a statistic is
(a) The probability that we obtain the statistic in repeated random samples
(b) The mechanism that determines whether randomization was effective
(c) The distribution of values taken by a statistic in all possible samples of the same sample size
from the same population
(d) The extent to which the sample results differ systematically from the truth
(e) None of the above.
The answer is
.
3.
A statistic is said to be
unbiased
if
(a) The survey used to obtain the statistic was designed so as to avoid even the hint of racial or
sexual prejudice
(b) The mean of its sampling distribution is equal to the true value of the parameter being
estimated
(c) Both the person who calculated the statistic and the subjects whose responses make up the
statistic were truthful
(d) It is used for honest purposes only
(e) None of the above.
The answer is
.
4.
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 Spring '11
 MR.Smith

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