Name ______Date ______
Extra PracticeBLM 8PT
Chapter 8 Practice Test
Copyright 2006, McGraw-Hill Ryerson Limited, a subsidiary of the McGraw-Hill Companies.
This page may be reproduced for classroom use by the purchaser of this book without the written permission of the publisher.
Name ______Date ______
Copyright 2006 McGraw-Hill Ryerson Limited, a subsidiary of the McGraw-Hill Companies.
This page may be reproduced for classroom use by the purchaser of this book without the written permission of the publisher.
Name ______Date ______
Selected Response
For each question, circle the best answer.
1. Where is 50% of the data located on this box-and-whisker plot?
A between 20-60 B between 60-100
C between 60-90 D between 80-100
2. Which graph would you use to compare the favourite sport of each student in your class with all other favourite sports?
A box-and-whisker plot
B circle graph
C histogram
D scatterplot
3. What is the median value in the stem-and-leaf plot data?
Stem / Leaf4 / 0
3 / 0 2
2 / 4 9
1 / 3 6 7 7 8 9
0 / 3
A 13B 14.5C 16D 18.5
4. Out of 400 students, 160 chose A, 60 chose B, and the rest chose C. Which graph represents the results?
AB
CD
5. In a scatterplot graph, the correlation means
A how closely the points fit a line
B the data is discrete
C the data is continuous
D the data shows a relationship
Short Response
6. On a sheet of graph paper, provide examples of the following scatterplots. Label the axes to illustrate a scenario for which each scatterplot may be created.
a) strong positive correlation
b) weak positive correlation
c) no correlation
d) weak negative correlation
7. Is the data for each table linear or non-linear? Justify your choice.
a)
x / y0 / 1
1 / 3
2 / 9
3 / 27
4 / 81
b)
x / y1 / 1
2 / 4
3 / 9
4 / 16
5 / 25
c)
x / y–5 / –14
–4 / –11
–3 / –8
–2 / –5
8. The height and head circumference of ten grade 9 students was recorded.
Head
(cm) /Height
(cm) /Head
(cm) /Height
(cm)32 / 98 / 37 / 110
35 / 112 / 43 / 130
40 / 120 / 50 / 140
32 / 95 / 41 / 125
46 / 128 / 38 / 115
a) Make a scatterplot of the data on a separate piece of paper. Use inspection to draw the line of best fit.
b) Describe the correlation between head circumference and height.
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c) Determine the equation of your line of best fit.
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d) If a student had a height of 135 cm, predict the circumference of the student's head. Use the graph and your equation.
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e) Did you use interpolation or extrapolation for part d)? Explain why and provide the opposite example.
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f) Can you conclude that the circumference of a person’s head determines their height? Explain.
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9. The last math test scores for 20 students are shown.
93, 99, 72, 68, 84, 80, 59, 83, 79, 62, 100, 82, 67, 72, 71, 83, 64, 69, 70, 91
a) Make a stem-and-leaf plot of the data.
Stem / Leavesb) Determine the mean, median, and mode of the scores.
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c) Make a histogram of the data.
d) Create a box-and-whisker plot for the data.
e) A score of 55 is added to the list in question 9. Calculate the new mean, median, and mode. Draw the new box-and-whisker plot.
f) How do the two box-and-whisker plots differ?
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10. The graph shows Heidi’s fruit bar sales for the school. She thinks her sales have doubled in the past week and she should earn the top-seller’s award. Explain to Heidi why she may not get the top-seller’s award. Draw the correct graph.
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Copyright 2006 McGraw-Hill Ryerson Limited, a subsidiary of the McGraw-Hill Companies.
This page may be reproduced for classroom use by the purchaser of this book without the written permission of the publisher.