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AP Statistics Practice Test Sampling
Distributions Confidence Intervals Chapt 9 & 10 |
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1 |
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According to the central limit theorem, the sampling distribution
__________________. |
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2 |
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The average height all monkeys is 48 with a standard deviation of 2 inches.
What is the standard deviation of monkey heights for the sampling
distribution of size ten? |
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3 |
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What effect does population size have on the mean and standard deviation of
a sampling distribution? |
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4 |
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Generally a statistic is used for |
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5 |
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Indicate which of the following can fit the binomial setting. Y=yes, N=no |
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________ If 90 % of consumers buy corn flakes then what is the
probability of randomly choosing 100 who don't buy corn flakes. |
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________ If a barrel of 10 monkeys contains 2 albino monkeys what is the
probability of getting both albinos in a given draw assuming no monkeys
are replaced after being drawn. |
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________ If 45% of all students wore Bob's Jumpy Shoes in 1978 what is the
probability of finding a random sample of 20 students that wear Bob's Jumpy
Shoes the year 2057? |
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6 |
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If the width of a confidence interval triples, what also had to happen to
the margin of error? |
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7 |
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If the sample size is increased by a factor of 2, what is the effect on the
margin of error? |
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8 |
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If the confidence level is changed from 80% to 95% what is the effect on the
margin of error? |
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9 |
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Which type(s) of error(s) will the margin of error account for? |
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10 |
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What is the z* for a confidence level of 85%? |
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Which types of studies can make use of confidence intervals? |
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12 |
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What is the minimum sample size for determining the mean length of widgets
in a manufacturing industry to a margin of error = plus or minus .2 given a
90% confidence interval and a standard deviation = 3. |
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13 |
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Which is more accurate, a margin of error with a confidence level of 65% or
a margin of error with a confidence interval of 90%? |
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14 |
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For an 80 % confidence interval, we are confident that _______________ . |
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80 % of confidence intervals constructed around a sample statistic will
contain the population parameter. |