Mr. Rogers  AP Statistics Objectives

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:  
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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