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School Store: Online Order Fit Checks worksheet preview

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School Store: Online Order Fit Checks

Fit informal straight-line models to school-store order data and evaluate closeness, unusual points, and curved patterns.

Grade 8MathInteractive · Printable

Aligned to8.SP.A.2

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What’s included

  • Single worksheet
  • Auto-graded online
  • 1 Common Core standard
  • Printable answer key
  • 13 questions
  • Classroom-ready

Details

Format
Interactive · Printable
Grade
Grade 8
Subject
Math
Question types
Fill in the blank, Multiple choice, Circle the answer, Short answer, Drawing

About this worksheet

What students practice

  • Students choose and draw informal straight lines that follow the center of scatter plot trends.
  • Students judge model fit using point-to-line distances and patterns across the observed data.
  • Students decide whether a straight-line model is useful for an online-order planning task.

How to use

Have students use a straightedge for the drawing task. Discuss why a useful line follows the overall pattern rather than every observation.

Curriculum

Common Core standard covered

8.SP.A.2

Know straight lines model linear trends in scatter plots, fit a line informally, and judge the fit by how close the points are.

Preview

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School Store: Online Order Fit Checks

Fit straight lines and decide when their estimates are useful.

Packing Online Orders

Each point represents one online order. Use the packing-time plot for Questions 1–5. A vertical gap is the distance between an observation and a line, measured in minutes.

01234567891012345678910Items in orderPacking time (min)
1.
Two orders with 4 items took different amounts of time to pack. How does this affect the use of a straight-line model?
  • A. It requires removing one order before evaluating any line.
  • B. It rules out a line because equal item counts must have equal times.
  • C. It allows a line that estimates time while individual orders vary.
  • D. It requires a separate line through every pair of observations.
2.
Imagine drawing each proposed straight line. Which would stay closest to the center of the packing-time observations?
  • A. A line through (1, 3) and (9, 7).
  • B. A line through (1, 1) and (9, 9).
  • C. A line through (1, 7) and (9, 3).
  • D. A line through (1, 5) and (9, 5).

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