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Tide-Pool Species: What Does the Evidence Show?

Compare tide-pool populations using random samples, box plots, means, medians, and measures of spread.

Grade 7MathInteractive · Printable

Aligned to7.SP.B.4

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What’s included

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

Details

Format: Interactive · Printable
Grade: Grade 7
Subject: Math
Question types: Fill in the blank, Multiple choice, Circle the answer, Short answer

About this worksheet

What students practice

Students compare population centers and spreads using summaries of random samples.
Students use sample variability to make cautious inferences about tide-pool populations.
Students evaluate how unusual values and repeated samples affect comparisons.

How to use

Use after teaching median, IQR, mean, and MAD. Have students annotate the displays before answering and distinguish sample facts from population inferences.

Curriculum

Common Core standard covered

7.SP.B.4

Compare two populations informally using the centers and spreads of random samples from each.

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Tide-Pool Species: What Does the Evidence Show?

Use sample centers and spreads to compare tide-pool populations.

Two Shores, Different Spreads

On a marine biology field trip, students count distinct species, not individual animals. For every study, pools have similar surface areas and receive the same search time. IQR = Q3 − Q1.

Students randomly select 24 pools from Cedar Shore and 24 from Slate Shore. These box plots summarize the number of distinct species found per pool.