Module: Data Analysis
Lesson: Line of Best Fit
Name
Date
Pd.
For each of the following, use the calculator to find the equation of the line of best fit and
then solve the problem.
1. A student who waits on tables at a restaurant recorded the cost of meals and the tip
left by single diners.
Meal Cost
Tip
$4.75
$0.50
$6.84
$0.90
$12.52
$1.50
$20.42
$3.00
$8.97
$1.00
If the next diner orders a meal costing $10.50, how much tip should the waiter expect
to receive?
Line of Best Fit
Tip expected
2. The table below gives the number of hours spent studying for a science exam (x) and
the final exam grade (y).
X
Y
2
77
5
92
1
70
0
63
4
90
2
75
3
84
Predict the exam grade of a student who studied for 6 hours.
Line of Best Fit
Grade expected
3. The table below shows the lengths and corresponding ideal weights of sand sharks.
Length
Weight
60
105
62
114
64
124
66
131
68
139
70
149
72
158
Predict the weight of a sand shark whose length is 75 inches.
Line of Best Fit
Weight expected
4. The table below gives the height and shoe sizes of six randomly selected men.
Height
Shoe size
67
8.5
70
9.5
73.5
11
75
12
78
13
If a man has a shoe size of 10.5, what would be his predicted height?
Line of Best Fit
Height expected
66
8