Constructing and
Interpreting
Confidence Intervals
Confidence Intervals
In this power point, you will learn:
Why confidence intervals are important in evaluation
research
How to interpret a confidence interval
How to construct a confidence interval you
AP Statistics Final Examination
Multiple-Choice Questions Answers in Bold
Name
Date
Period
Answer Sheet: Multiple-Choice Questions
1.
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A B C D E
14.
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2.
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15.
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Condence Intervals For Proportions and
Choosing the Sample Size
A Large Sample Condence Interval for a Population Proportion
Recall that a condence interval for a population mean is given by
Condence Interval for a Population Mean
zc s
x
We can make a sim
574 CHAPTER 22 Comparing Two Proportions
@1 ﬁniine social networking. The Parents 8: Teens 2006
Survey of 935 '12- to 17-year-olds found that, among teens
aged 15717, girls were significantly more likely to have
used social networking sites and online pro
MChan CH22
1,2,4,5,6,8,9,17,18,19,20,22,25,26,and28
1.) That the difference in use of social media shown is unlikely as a statistical probability.
2.) That the difference in likely due to statistical probability.
4.) The P value is fairly high, so it woul
MCHAN CH18
1,2,3,4,5,7,9,12,18,20,27,28,29,30,31,32,34,37,39,40,44,46,49,50,and51.
1.) As the sample size gets larger, it seems to follow the central limit theorem. The distribution
becomes more normal, and p approaches .5
2.) Again, we see the central li
Mchan CH.23
1, 5, 9, 12, 13, 13f
1.)
a.) 1.74
b.) 2.37
c.) .0524
d.) .0889
5.)
a.) 95% confidence is meant for the population of a random sample, not specifically those
studied.
b.) Confidence interval is for a sample of cows, not individual
c.) The avera
MCHAN CH19
1,3,5,7,8,18,19,21,22,23,24,27,28,30,32,and34.
1.) That she has about 95% confidence, and that her estimated proportion is within 4%
3.)
a.) Population is all cars being driven, the sample are those that are stopped. p is proportion of
cars wit
CH 14.
1.)
a.) (HH, HT, TT, TH), equally likely
b.) (1,2,3,) Not very likely to have all 3 boys.
c.) (H, TH, TTH, TTT) not very likely to land 3 consecutive
d.) (1,2,3,4,5,6)
2.)
a.) (1,2,3,4,5,6,7,8,9,10,11,12) More likely to hit middle numbers because o
MChan CH 24
1,2,3,5,11,12,14,15,21,23,25,33,34,35,and38.
1. Yes, the high P value makes it a statistical probability for the mean difference.
2. Yes, the high P value makes it a statistical probability for the mean difference.
3.
a.) It means that the mea