Linear regression & correlation worksheet with answers

Free printable Linear regression & correlation worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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Name: ____________________   Date: ____________

1.Easy
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The table gives 5 paired observations of x = load in kN and y = extension in mm. Use the least-squares line ŷ = a + b·x. Find the slope b.

n = 5
b =
2.Easy
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The table gives 6 paired observations of x = hours studied and y = exam score. Use the least-squares line ŷ = a + b·x. Find the slope b.

n = 6
b =
3.Medium
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The table gives 5 paired observations of x = temperature in °C and y = ice creams sold. Their sums are given. Find Pearson's correlation coefficient r from these sums.

n = 5Σx = 115Σy = 648Σx² = 2735Σy² = 87520Σxy = 15462
r =
4.Medium
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The table gives 6 paired observations of x = car age in years and y = price in k€. Find Pearson's correlation coefficient r.

n = 6
r =
5.Hard
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The table gives 6 paired observations of x = car age in years and y = price in k€. Use the least-squares line ŷ = a + b·x. A new observation (3.5, 23) is made. Find its residual e = y − ŷ.

n = 6(3.5, 23)
e =
6.Hard
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The table gives 5 paired observations of x = hours studied and y = exam score. Use the least-squares line ŷ = a + b·x. A new observation (9, 112) is made. Find its residual e = y − ŷ.

n = 5(9, 112)
e =

Answer key

  1. 1. b = 2.4
  2. 2. b = 3.029
  3. 3. r = 0.9887
  4. 4. r = −0.9681
  5. 5. e = 4.833
  6. 6. e = −2

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