Mr. Rogers - AP Statistics Objectives
 Unit Plan Practice Test

AP Statistics  Practice Test Sampling Distributions Confidence Intervals

___ 1 ) According to the central limit theorem, the sampling distribution __________________.

___ 2 ) 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?

___ 3 ) What effect does population size have on the mean and standard deviation of a sampling distribution?

___ 4 ) Generally a statistic is used for

5 ) Construct 95% confidence for the following:

 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.

___ 6 ) If the width of a confidence interval triples, what also had to happen to the margin of error?

___ 7 ) If the sample size is increased by a factor of 2, what is the effect on the margin of error?

___ 8 ) If the confidence level is changed from 80% to 95% what is the effect on the margin of error?

___ 9 ) Which type(s) of error(s) will the margin of error account for?

___ 10 ) What is the z* for a confidence level of 85%?

___ 11 ) Which types of studies can make use of confidence intervals?

___ 12 ) 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.

___ 13 ) 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%?

___ 14 ) For an 80 % confidence interval, we are confident that _______________ .

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