# Unit 7 Study Guide

```715 Unit 7 Study Guide
Name:______________________ Period:__________
Felgenhauer
Ancona
1) The dot plots compare the age of boys and girls in a tumbling class. Use the dot plots to identify
each of the statements as True or False.
_____________ Both data sets have a mode of 1.
_____________ Both data sets have the same range.
_____________ The data for the boys has an outlier.
_____________ Most girls are 3 years old or younger.
Use the box plots for #2-5. They show the scores for 14 students on two different chapter tests.
2) Compare the centers of the box plots using
the medians.
3) Compare the spreads of the box plots using
the ranges. Show work.
Chapter 9: ____________
Chapter 9: ____________
Chapter 10: ___________
Chapter 10: ___________
__________________has a greater median.
__________________has a greater range.
4) Compare the spreads of the box plots
using the interquartile ranges. Show
work.
Chapter 9: ____________
Chapter 10: ___________
__________________has a greater IQ range.
5) Identify each statement as True or False.
____________ The upper quartiles are the same.
____________ 50% of students scored a 60% or
better on the Chapter 10 test.
Use the data set for questions #6-11.
The data set shows the ages of a random sample of children under 13 who own a hover craft.
Children’s Ages
7, 9, 8, 10, 12, 11, 13,13, 12,12
6) Make a dot plot to display the data.
0
5
10
15
Children’s Ages
7) Make a box plot to display the data.
 the lowest value
 the highest value
 the median
 the lower quartile
 upper quartile
0
5
8) What is the age range? Show work.
10)
What is the interquartile range?
Show work.
10
15
9) What is the most common age?
11)
For this data set, is a child more or less likely
to be younger than 10?
Use the information to answer questions #12-13.
Statistical measures are shown below for the number of hours per week spent watching television by the
students in seventh and eighth grade.
Seventh Grade: Mean number of hours spent watching T.V. = 18; (MAD) Mean absolute deviation = 4
Eighth Grade: Mean number of hours spent watching T.V. = 22; (MAD) Mean absolute deviation = 2
12) Find the difference between the means.
13) Complete the statement. Fill in the blank.
The difference of the means is __________ times
Average monthly temperatures (in ˚F) for two cities are shown in the tables below.
Use the data for questions #13-17.
City 1
85, 81, 85, 68, 82, 84, 83, 81, 77, 79, 69, 80
City 2
75, 77, 79, 95, 90, 88, 88, 87, 85, 82, 75, 77
14) Calculate the mean for City 1 (to the nearest
degree). Show work.
15) Calculate the mean for City 2 (to the
nearest degree). Show work.
16) What is the difference in the means?
Show work.
17) What is the difference of the ranges?
Show work.
18) Compare the differences of the means as a multiple of the actual ranges. Show your work.
The means of the two data sets differ by about _____________ times the variability (range).
19)
Sean and Lauren want to know what fitness equipment people prefer at the gym.
They each had different ideas on how to choose their sample.
Sean: I can ask the first 50 gym member that enters.
10 people lifting weights.
a) Whose sampling method is better? Explain.
______________________________ because ____________________________________________________
_____________________________________________________________________________________________
b) To survey their sample, Lauren poses the question, “Do you like the treadmill
best?” Determine whether or not the question is biased. Explain.
_________________________________________________________________________________________________
_________________________________________________________________________________________________
_________________________________________________________________________________________________
20)
There are 750 students at Frost Junior High. The results of
a random sample of students at the school are shown in the
table.
Estimate the number of students that prefer each class.
____________ Math
_____________ Science
___________ Social
Studies
Favorite Subjects
Math
49
Science
Social
Studies
Language
Arts
35
16
30
_________Language
Arts
21)
In a survey about new park, which
group is least likely to be a biased
sample?
22)
a) randomly chosen gym members
new colors for their jerseys.
Which group should you ask to get
a random sample of opinions?
b) randomly chosen drivers
c) randomly chosen shoppers at a mall
b) every tenth student who enters
the school in the morning
d) randomly chosen joggers
c) 40 football players
d) the people that did not make
the team
Show work. Label units.
In a shipment of 2,000 beach balls, 150 are defective. The beach ball company uses a random sample to
simulate 20 beach balls to inspect in the next shipment. The integers 1-150 represent defective
beachballs.
23)
43
1702
628
357
14
1432
1915
457
769
1312
85
57
1721
65
9
1441
1663
699
145
1840
Based on this sample, how many defective pens might the manufacturer expect in the next
shipment of 2000 pens?
24)
Each cell in the table below represents the number of kids in each family. A real estate agent uses
a random sample (the shaded numbers) to estimate the average number of kids in each family.
Show work and label units.
4
1
3
2
2
3
0
8
2
5
9
3
4
4
5
a) Find the mean of the random sample.
b) Use your answer from part a to estimate the total number of kids in the neighborhood.
1) F, F, T, F
2) 77.5, 65,
Chapter 9
3) 35, 30,
Chapter 9
4) 20, 15,
Chapter 9
5) F, F
8) 6 years
10) 3 years
11) Less
likely
1.23
12) 4
15) 83.2°
9) 12 years
old
16) 3.7°
21) c
22) b
23) 700 pens
24a) 5.2
24b) 78 kids
17) 3
19a) Sean;
Explanations
will vary
6) Teacher
will show in
class
1
13) 2
7) Teacher
will show in
class
14) 79.5°
19b) Biased;
Explanations
will vary
20) Math 283
Science 202
SS 92
LA 173
```
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