AP Statistics
Today: Midterm Exam Review
(Open Ended)
Tomorrow: Midterm Exam Review
(Multiple Choice: Clickers)
Reminder
AP Statistics Midterm Exam Friday
*You may use the AP formula sheet*
AP Statistics Midterm Exam Details
15 Multiple Choice Questions
4 Open Ended Questions (Pick 2)
o Topic #1 (Normal Model / Empirical Rule)
Reference Unit I Test #11
o Topic #2 (Linear Model: Re-expressing to straighten association)
Reference Unit II Test #11
o Topic #3 (Random number simulation)
Reference Unit III Test #12
o Topic #4 (Design an experiment)
Reference Unit III Test #13
Please select a Team.
1.
2.
3.
4.
5.
6.
7.
Team 1
Team 2
Team 3
Team 4
Team 5
Team 6
Team 7
0%
0%
0%
0%
0%
0%
0%
1
2
3
4
5
6
7
Which of the following best describes how many
outliers the original data set has?
a. None
b. Exactly one, the maximum
c. Exactly two, the minimum and the
maximum
d. At least one, the maximum (but not the
minimum)
e. At least one, the minimum (but not0%the0% 0% 0%
maximum)
a.
b.
c.
d.
0%
e.
.
1
1.
2.
3.
4.
5.
.
.
.
.
.
1
1
0%
1
0%
0%
2
3
0%
0%
4
5
Team MVP
Points
Team
Participant
.
$
1.
2.
3.
4.
5.
.
GPA
 2830  25300($)
94%
.
GPA
 2830  25300($)
.$  2830  15300( gpa)
.$  3230  15300( gpa)
.$  2830  25300( gpa)
6%
0%
1
2
3
0%
0%
4
5
Mrs. Erb’s Unit I test scores follow the normal model.
The mean test score was 85 with a standard deviation
of 3.
You earned a test score of 87%.
What percent of your classmates scored lower than
you?
88%
1.
2.
3.
4.
5.
70.75%
71.75%
72.75%
73.75%
74.75%
6%
0%
1
6%
0%
2
3
4
5
Participant Scores
15
Spencer M
15
15
15
15
Rebecca M.
Participant 22
Amanda Z.
Besty A.
Mrs. Erb’s Unit I test scores follow the normal model.
The mean test score was 82 with a standard deviation
of 4.
Your score was the 96th percentile.
What was your score?
81%
1.
2.
3.
4.
5.
87%
88%
89%
90%
91%
6%
6%
6%
0%
1
2
3
4
5
.
1.
2.
3.
4.
5.
.
.
.
.
.
88%
6%
6%
0%
1
0%
2
3
4
5
Fastest Responders (in seconds)
31.58
Besty A.
34.78
35.01
36.78
46.41
Rebecca M.
Connor C.
Emily C.
Adian T.
.
1.
2.
3.
4.
5.
.tˆ  40.3266  5.95956(concentration) Write the equation of the LSRL
.tˆ  5.95956  40.3266(concentration)
c.ˆ  40.3266  5.95956(time)
c.ˆ  5.95956  40.3266(time)
c.ˆ  40.3266  5.95956(time)
71%
24%
6%
0%
1
0%
2
3
4
5
.
Interpret the coefficient of determination (R2)
1. 90.8% of the variability is on the line of best fit
2. 90.8% of the variability in time is accounted for using
the variation in concentration
3. 90.8% of the variability in concentration is accounted
for using the variation in time
0%
4. None of these is the correct interpretation
1
76%
24%
0%
2
3
4
Team MVP
Points
Team
Participant
19
19
18
17
Team 5
Team 6
Team 1
Team 4
Rebecca M.
Spencer M
Besty A.
Emily C.
13
Team 2
Connor C.
.
74%
1.
2.
3.
4.
5.
.
.
.
.
.
21%
5%
0%
1
2
3
0%
4
5
.
1.
2.
3.
4.
5.
.
.
.
.
.
68%
21%
5%
5%
0%
1
2
3
4
5
Participant Scores
21
Rebecca M.
21
21
20
20
Participant 22
Amanda Z.
Spencer M
Brendan O.
.
1.
2.
3.
4.
5.
.
.
.
.
.
67%
28%
6%
0%
1
0%
2
3
4
5
A basketball player has a 70% free throw percentage. Which
plan could be used to simulate the number of free throws she
will make in her next five free throw attempts?
1.
2.
3.
4.
5.
I only
II only
III only
II & III only
I, II, & III
72%
17%
11%
0%
1
0%
2
3
4
5
Fastest Responders (in seconds)
16.3
Emily C.
17.83
21.39
25.7
31.4
Andrew N
Brendan O.
Linsea P
Amanda Z.
A consumer group wants to see if a new education
program will improve the spending habits of
college students. Students in an economics class
are randomly assigned to three different courses
on spending habits.
What are the experimental units?
94%
1.
2.
3.
4.
5.
The new education program
Three different courses
The spending habits of college students
The consumer group
6%
0%
The students in the economics class
1
2
0%
3
0%
4
5
.
1.
2.
3.
4.
5.
.
.
.
.
.
82%
6%
6%
6%
0%
1
2
3
4
5
Participant Scores
25
Participant 22
25
24
24
24
Amanda Z.
Brendan O.
Rebecca M.
Spencer M
The January 2005 Gallup Youth Survey telephoned a random
sample of 1,028 U.S. teens and asked these teens to name
their favorite movie from 2004. Napoleon Dynamite had the
highest percentage with 8% of teens ranking it as their
favorite movie. Which is true?
1.
2.
3.
4.
5.
A) I only
B) II only
C) III only
D) I and II
E) I, II, and III
58%
21%
11%
11%
2
3
0%
1
4
5
Suppose your local school district decides to randomly test high
school students for attention deficit disorder (ADD). There are
three high schools in the district, each with grades 9-12. The
school board pools all of the students together and randomly
samples 250 students. Is this a simple random sample?
1. A) Yes, because the students were chosen at random.
67%
2. B) Yes, because each student is equally likely to be chosen.
3. C) Yes, because they could have chosen any 250 students from
throughout the district.
4. D) No, because we can’t guarantee that there are students
from each school in the sample.
17%
5. E) No, because we can’t guarantee that there are students11%
6%
from each grade in the sample.
0%
1
2
3
4
5
Team Scores
13.8
Team 6
13
9.92
8.67
4.5
Team 5
Team 4
Team 1
Team 2