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AP Statistics Practice Test Sampling
Distributions Confidence Intervals |
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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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Construct 95% confidence for the following: |
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| a) A survey of 1000 voters indicates that 60% will vote for the purple party. |
| b) The community garden has an average of 40 worms/square ft. with s= 4, based on a sample of 9 test squares. |
| c) Bob's turnips have a standard deviation of 4. Martha takes a sample 0f 16 out of the latest shipment and gets a mean of 26. |
d) Bart takes measures an average height of elves = 42 and an s = 4 for a sample 0f 16 elves. |
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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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11 |
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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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