AP Statistics
1st 9 Wks Exam
1.
Determine if it is descriptive or inferential
statistics.
a. According to the Census Bureau, 20% of
all American workers get to work by
carpool
4. Classify the type of sampling as being either
cluster, systematic, convenience, random, or
stratified.
a. we will survey every 5th person who
comes in the door.
b. Put all the names in a hat and draw out 5
names
c.
b. Allergy therapy may make bees go away.
c.
The average salary at the company is
$55,000 per year.
d. Survey the first 5 people I see because I
don’t have much time
e.
2. Classify as qualitative or quantitative.
a. married or not married
b. number of books in your locker
c.
143
142
138
173
138
120
d. weight of a rock
A: defective or nondefective
B: the employee number of the individual
who assembled the part
C: the weight of the part.
a.
What is the population?
Separate everyone according to eye color
and then choose 4 from each group.
5. During July, a private pool recorded the
weights of 30 males in its water aerobics
class.
rocks divided into categories
3. A Quality-control technician selects
assembled parts from an assembly line and
records the following information.
We will survey everyone in two of the
schools out of the district
a.
156
171
158
157
172
125
156
170
160
158
166
165
163
169
162
159
166
136
167
164
164
160
159
168
Construct a frequency distribution for
the data. Use six classes.
b. Construct a histogram.
6. The number of vehicles passing a tollgate
between 7 am and 8 am were recorded for
twenty different days.
10
46
20
26
27
16
32
33
12
15
27
22
16
15
30
22
16
41
b. What is the sample?
c.
Classify the three variables as either
categorical or quantitative.
a.
b.
c.
d.
e.
f.
g.
h.
Construct a stem & leaf
Find the mean
Find the median
Find the mode.
Construct the box plot
Find the thirtieth percentile.
Find the variance
Find the standard deviation.
31
19
7. If x  6 , x  20 , and s  9 , what is the zscore. What does it mean?
10. What is the mean of a test distribution if
32% of the people make less than 420 and
the standard deviation is 5.4?
8.
11. Explain each of the following basic designs.
a. Simple random sample
The diastolic blood pressure x, and the
systolic blood pressure, y, were recorded for
13 females.
x
y
76 70 82 90 68 60 62
122 102 118 126 108 130 104
x
y
60 62 72 68 80 74
118 130 116 102 122 120
a.
Find the correlation coefficient.
b. Find the linear regression line.
c.
What is the predicted value of y for x =
65?
d. Explain the slope.
e.
Find the residual for a diastolic blood
pressure of 70.
b. Randomized block design
c.
Matched pairs
12. Define each type of bias and give an example.
a. Response
b. Measurement
c. Selection
d. Non-Response
13. Define each type of sampling and give an
example.
a. Convenience
b. Voluntary
c. Stratified
d. Systematic
e. Cluster
14. How do I randomly allocate 60 people to
three different treatment groups.
f.
g.
9.
What % of the variation can be explained
by the least squares line?
15. What is the difference between the factors
and the treatments?
What is the typical deviation from the
regression line?
If a standardized test has a mean of 88
points with a standard deviation of 3.4
points. Find the following.
a. What is the probability that a
person makes at least a 90?
16. What is the difference between the
explanatory variable and the response
variable?
17. What is the difference in a single blind and a
double blind experiment?
18. Why do we use a control group?
b. What is the cutoff score for the
65th percentile?
19. Why do we use a placebo?
c.
20. Why do we block?
What is the probability that a person
makes between 85 and 92?