AP Statistics

1
AP Statistics

• Chapter 3 Review

2
As the ellipse formed by points on a scatterplot
becomes thinner, the strength of the correlation
between the scores

1. Becomes lower
2. Becomes higher
3. Remains constant
4. Becomes zero

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
3
The lowest strength of correlation of the
following is

1. 0.26
2. -0.45
3. 0.05
4. -0.90

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
4
The following are resistant

1. Least squares regression line
2. Correlation coefficient
3. Both of the above
4. Neither of the above
5. It depends

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
5
Fastest Responders (in seconds)
23.64 Participant 1
34.13 Participant 4
34.5 Participant 12
42.24 Participant 11
42.53 Participant 14





6
Which of the following would not be a correct
interpretation of r -.30?

1. Variables are inversely related.
2. Coefficient of determination is .09.
3. 30 of variation between variables is linear.
4. There is a weak relationship between the
   variables.
5. All above are correct.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
7
Equation for LSRL is y-hat 1.3 0.73x . What
is the residual for the point (4,7)?

1. 2.78
2. 3.00
3. 4.00
4. 4.22
5. 7.00

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
8
Imagine two boys on a seesaw moving up and down.
The r value of their heights off the ground would
be

1. 0.00
2. 1.00
3. -1.00
4. 0.50
5. -0.50

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
9
Participant Scores
600 Participant 11
500 Participant 7
500 Participant 8
500 Participant 14
500 Participant 17





10
If the correlation between X and Y is 0.94,
which is true?

1. X causes Y
2. Y causes X
3. Low scores on X are associated with high scores
   on Y
4. Low scores on X are associated with low scores on
   Y.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
11
A residual plot for linear data looks linear.

1. True
2. False

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
12
Test A results correlate -0.94 with results on
the Natl Merit Scholarship exam. Because of the
negative sign, this relationship is considered to
be weak.

1. True
2. False

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
13
Fastest Responders (in seconds)
7.8 Participant 4
9.55 Participant 9
10.77 Participant 12
11.16 Participant 3
11.34 Participant 1





14
Switching the explanatory and response variables
on a scatterplot affects the

1. Correlation
2. LSRL
3. Both the above
4. Neither the above
5. It depends

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
15
If the coefficient of determination between two
variables is 0.81, then the correlation is 0.90.

1. True
2. False
3. It depends

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
16
A point on a scatterplot represents

1. Two scores of 2 people.
2. One score made by 2 different people.
3. Two different scores of 1 person.
4. One score of 1 person.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
17
Participant Scores
900 Participant 14
900 Participant 17
800 Participant 1
800 Participant 2
800 Participant 11