Answers - Chapter 7 : Test A and Test B
7A
Test 7A
1. c 2. c, 3. d 4 .c, 5. b , 6 . X = payout
7. X
P(X)
$ 100 10
1/20 1/20
5
2
1
3/20 5/20 10/20
8. X = $ 7.25
9. No. The game would be fair if =amount paid to play. Since, you pay $ 20 to play and your exp
Answers to the Practice Quizzes and Tests Chapter 4
Quiz 4.2A:
1. Case 18 : ( 42,57) is influential because without this point, the slope of the regression line would be less steep.
2. Case 19: ( 17,121) is a regression outlier because it has a large resi
Answers to:
TEST 2C
1 C , 2 B , 3 B, 4 C, 5 D, 6 E, 7 A, 8 B, 9 E, 10 E
11. a) 0.1729 or 17.3%
b) 0.07765 or 7.77%
12. a) 327 to 345 day
b) 16%
13. a) 1.28, - 1.28
b) 286 , 245 days ( Approx)
14. This shape is strongly skewed to the right. If the distribu
ANSWERS : Test 3 B, Test 3A, Quiz 3.1 C, Quiz 3.1 A
Test 3B:
1 a, 2 d, 3 b , 4 d, 5 c, 6 e, 7 b , 8 a, 9 a, 10 d,
12: y hat = 5.359 + 2.6838 x
13: r = 0.85. Moderately strong positive association.
14: y-hat(3) = 9 ( 5.359 + 2.6838 (3) = 9 - 13.41 = - 4.41
5.1
Designing Samples
1. What is an observational study?
An observational study observes individuals
and measures variables of interest but does not
attempt to influence the responses.
2.
What is an experiment?
An experiment deliberately imposes some
trea
Explanation for # 10 ( Test 6C) there are two ways for solving this, you decide which is better for
you:
way one: (the positive approach)
to win at least once, you need to:
win 1 time, and loss 4 times
0.11*0.89*0.89*0.89*0.89
or
win 2 times, and loss 3
CHAPTER 8 REVIEW
8.1 THE BINOMIAL DISTRIBUTIONS
OVERVIEW: The binomial distribution is frequently useful in situations where there are
two outcomes of interest, such as success or failure. It is often used to model real-life
situations, and it finds its w
Ch. 9 review AP Statistics
Name _
1. The sampling distribution of a statistic is
A) the probability that we obtain the statistic in repeated random samples.
B) the mechanism that determines whether randomization was effective.
C) the distribution of value
AP Statistics, NOTES: t-distributions.
If we dont know the true population standard deviation (remember it is unreasonable to assume we
WILL know it), we can use the sample standard deviation, s, to approximate . Our accuracy depends on
the sample size of
Inferences for Distributions
Inference for the Mean of a Population
Confidence intervals and tests of significance for the mean are based on the
sample mean x .
The sampling distribution of x has as its mean.
That is, x is an unbiased estimator of the unk