Name: 
 

Chapter 9 Test


Short Answer
 

 1. 
The scatter plot shows the total earnings (wages and tips) of a food server during 1 day.

sa001-1.jpg
a.   About how many hours must the server work to earn $40?
b.   About how much did the server earn for 5 hours of work?
c.   Describe the relationship shown by the data.
 
 
Find and interpret the marginal frequencies.
 

 2. 
  
School Play
  
Attend
Not Attend
Class
Junior
21
33
Senior
34
43
 

 3. 
You randomly survey students in your school about whether they prefer communicating by text or email. The results are shown in the tally sheets. Make a two-way table that includes the marginal frequencies.
Prefers Texting
Student
Tally
Malesa003-1.jpgsa003-2.jpgsa003-3.jpg
Femalesa003-4.jpgsa003-5.jpgsa003-6.jpg

Prefers Emailing
Student
Tally
Malesa003-7.jpgsa003-8.jpgsa003-9.jpg
Femalesa003-10.jpgsa003-11.jpgsa003-12.jpg
 
 
Choose an appropriate data display for the situation. Explain your reasoning.
 

 4. 
the revenue of a company each week
 

 5. 
the heights of trees on school property in four equal-size groups
 

Other
 

 1. 
Extended Response  The table shows the high temperature (°F) on July 4 for the past 7 years and the number of water bottles sold at the parade in each year.
Temperature (°F), x
82
89
87
81
79
93
90
Water Bottles, y
394
438
423
397
378
449
420
a.   Graph the data in the table and draw a line of fit.
b.   Write an equation of the line of fit.
c.   Predict the number of water bottles that would be sold if the temperature were 72°F.
d.   Explain the significance of the slope and the y-intercept in the line of fit.
 

 2. 
Extended Response  A survey asked 100 students to choose their favorite fruits. The results are shown in the circle graph.

ot002-1.jpg

a.  Explain why the graph is misleading.
b.  What type of data display would be more appropriate for the data?
 



 
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