


AP Statistics Practice Test Sampling
Distributions Confidence Intervals Chapt 9 & 10 




___ 
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 
) 
Indicate which of the following can fit the binomial setting. Y=yes, N=no 

________ If 90 % of consumers buy corn flakes then what is the
probability of randomly choosing 100 who don't buy corn flakes. 
________ 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. 

________ 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? 




___ 
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 _______________ . 



80 % of confidence intervals constructed around a sample statistic will
contain the population parameter. 