Lesson Plan
Science Sleuths Lesson Plan
Students will act as Science Sleuths to interpret real-world data, formulate and test hypotheses, and draw evidence-based conclusions through a guided worksheet activity and class discussion.
Building analytical and critical thinking skills is essential for scientific literacy. This lesson engages 7th graders in hands-on data interpretation and hypothesis testing, helping them learn to question, analyze, and support conclusions with evidence.
Audience
Middle School Students (7th Grade)
Time
30 minutes
Approach
Hands-on data analysis, paired work, and whole-class debrief foster critical thinking.
Materials
Science Sleuths Worksheet, Mystery Data Set, Guided Analysis Slide Deck, and Chart Paper and Markers
Prep
Review and Prepare Materials
10 minutes
- Print enough copies of the Science Sleuths Worksheet for each student
- Preview the Mystery Data Set to familiarize yourself with trends and possible student questions
- Load the Guided Analysis Slide Deck and set up any projection equipment
- Gather chart paper and markers for group reporting
Step 1
Introduction to Scientific Sleuthing
5 minutes
- Project the first slide of the Guided Analysis Slide Deck to present a real-world scenario (e.g., environmental data on local air quality)
- Ask students: “What questions would a scientist ask about this data?”
- Define key terms: observation, hypothesis, data interpretation, evidence-based conclusion
Step 2
Data Analysis Activity
15 minutes
- Distribute the Science Sleuths Worksheet and the Mystery Data Set
- In pairs, students record observations, propose a hypothesis, and analyze the data to support or refute it
- Encourage note-taking: identify patterns, anomalies, and potential sources of error
- Teacher circulates, asks guiding questions, and prompts deeper thinking
Step 3
Group Discussion
8 minutes
- Post chart paper around the room labeled with each pair’s names
- Students transfer their key findings and conclusions onto chart paper
- Facilitate a gallery walk: pairs rotate and ask one question or leave one comment on another group’s paper
- Reconvene and highlight interesting hypotheses and data interpretations
Step 4
Wrap-Up and Reflection
2 minutes
- Ask students to write a quick exit ticket: one evidence-based conclusion from today’s data and one new question they have
- Collect exit tickets to assess understanding and inform next steps

Slide Deck
Science Sleuths: Guided Data Analysis
Today, you are Science Sleuths! We will:
• Examine a real-world dataset
• Define key scientific terms
• Make observations, form hypotheses, and analyze data
• Share findings and reflect on our process
Welcome the class and introduce the concept of being Science Sleuths. Explain that over the next 30 minutes, they will learn to observe data, propose hypotheses, analyze results, and draw evidence-based conclusions—just like real scientists.
Real-World Scenario: Local Air Quality
Imagine you are investigating air quality in your town over the past month. Below is a chart of daily AQI (Air Quality Index) values.
• What patterns do you notice?
• Are there days that stand out? Why?
Project the dataset graphic (e.g., a chart showing daily air quality measurements). Ask students to note what they see before reading any labels.
Key Scientific Terms
Observation: Objective note about the data (e.g., “AQI rose sharply on day 14”).
Hypothesis: A testable explanation (e.g., “Traffic is higher on weekends, causing spikes”).
Data Interpretation: Looking for patterns, anomalies, and trends.
Evidence-Based Conclusion: A finding supported directly by your data.
Clarify each term with examples drawn from the chart. For instance, an ‘observation’ might be “AQI peaked on day 14.”
Step 1: Make Observations
• Record at least three observations from the Mystery Data Set.
• Note any peaks, valleys, or sudden changes.
• Identify days that don’t fit the overall trend.
Direct students to open their Science Sleuths Worksheet to the Observation section.
Step 2: Formulate a Hypothesis & Analyze
• Write one hypothesis explaining the pattern you observed.
• Use the Mystery Data Set to test your idea:
– Does the data support or refute your hypothesis?
– What evidence strengthens or weakens it?
Explain that a good hypothesis ties directly to their observations and can be tested with the data they have.
Step 3: Draw Evidence-Based Conclusions
• Summarize your conclusion in one or two sentences.
• Cite two pieces of data that support your conclusion.
• Consider any limitations or alternative explanations.
Model how to link specific data points to a conclusion. E.g., “Because day 14’s AQI jumps after a holiday event, we conclude celebrations increased pollution.”
Next Steps: Gallery Walk & Reflection
• Post findings on chart paper and walk around to leave one question or comment on a peer’s work.
• Exit Ticket (2 min):
- One evidence-based conclusion from today’s data.
- One new question you have.
Outline the gallery walk procedure and exit ticket collection. Emphasize respectful feedback and thoughtful questions.

Worksheet
Science Sleuths Worksheet
Name: ____________________________ Date: _______________
In this activity, you will act as Science Sleuths. Use the Mystery Data Set to complete each section below. Think carefully, use evidence from the data, and write clearly.
1. Observations (Record at least three objective notes about the data)
- Observation 1:
- Observation 2:
- Observation 3:
2. Hypothesis
Write one testable hypothesis that could explain the patterns or anomalies you observed.
3. Data Analysis
Using the Mystery Data Set, answer the following questions:
-
Does the data support or refute your hypothesis? Explain your reasoning.
-
What two specific data points or trends strengthen your hypothesis?
a.
b.
-
What evidence or observations challenge your hypothesis?
-
Identify any unexpected patterns or anomalies you found.
-
What potential sources of error or alternative explanations should you consider?
4. Evidence-Based Conclusion
Summarize your conclusion in one or two clear sentences. Be sure to cite at least two pieces of data from the set.
5. Exit Ticket / Reflection
- One evidence-based conclusion from today’s data:
- One new scientific question you have after this investigation:


Reading
Mystery Data Set
Imagine you are investigating the air quality in Townsville over a 30-day period. Each day, scientists recorded the Air Quality Index (AQI). An AQI between 0–50 is “Good,” 51–100 is “Moderate,” and 101–150 is “Unhealthy for Sensitive Groups.” Use this table to complete your Science Sleuths Worksheet.
Day | AQI | Day | AQI | Day | AQI |
---|---|---|---|---|---|
1 | 55 | 11 | 55 | 21 | 72 |
2 | 60 | 12 | 60 | 22 | 58 |
3 | 58 | 13 | 59 | 23 | 57 |
4 | 62 | 14 | 75 | 24 | 53 |
5 | 65 | 15 | 65 | 25 | 56 |
6 | 59 | 16 | 63 | 26 | 60 |
7 | 70 | 17 | 61 | 27 | 62 |
8 | 52 | 18 | 66 | 28 | 67 |
9 | 50 | 19 | 64 | 29 | 59 |
10 | 57 | 20 | 68 | 30 | 61 |
Notes for analysis:
- Look for days with unusually high AQI (peaks) or low AQI (valleys).
- Consider possible causes for spikes around days 7, 14, 21, and 28.
- Identify any patterns (e.g., weekend vs. weekday) or anomalies.


Discussion
Science Sleuths: Whole-Class Discussion Guide
Discussion Objectives
- Deepen understanding of data interpretation and evidence-based reasoning
- Share and compare hypotheses and conclusions
- Reflect on the scientific thinking process and consider real-world implications
Discussion Guidelines
- Listen respectfully to each group’s ideas
- Refer explicitly to data points in the Mystery Data Set
- Ask clarifying questions and offer constructive feedback
- Use scientific vocabulary: observation, hypothesis, evidence, conclusion
1. Sharing Observations (5 minutes)
- Invite 3–4 pairs to share one key observation each from their Science Sleuths Worksheet.
• Follow-up: “Which data point made you notice that pattern?”
• Deepen: “Did anyone else see the same thing? Why or why not?”
2. Comparing Hypotheses (8 minutes)
- Ask: “What hypothesis did your group propose to explain the data pattern?”
• Prompt: “How did you link your observation to your hypothesis?” - Invite one group whose hypothesis was different to present.
• Follow-up: “What evidence led you to a different explanation?” - Discuss: “Which hypothesis seems strongest? Why?”
• Push further: “Can you identify a specific AQI spike or valley that supports or challenges it?”
3. Evidence-Based Conclusions (8 minutes)
- Request: “Share your final conclusion in one sentence and cite two data points that support it.”
• Example: “Our conclusion is … because Day 14’s AQI jumped to 75 after the festival and Day 7’s spike to 70 coincides with a weekend pattern.” - Ask the class: “What limitations or alternative explanations did you consider?”
• Follow-up: “How could we collect more data to test those alternatives?”
4. Reflection & Extension (7 minutes)
- Pose a reflective question:
• “How did the process of observation → hypothesis → analysis → conclusion help you think like a scientist?” - Extension prompt:
• “If you were the Townsville mayor, what policy or action might you recommend based on today’s findings?”
• “What additional environmental or social data would strengthen your recommendation?” - Final quick-write:
• “One thing you learned about interpreting real-world data”
• “One new question you still have”
(Collect responses as an exit ticket.)
Materials for Reference:
• Science Sleuths Worksheet
• Mystery Data Set
Use this discussion guide to structure your debrief, foster critical thinking, and connect classroom analysis to real-world scientific inquiry.


Warm Up
Quick-Think Warm-Up
Time: 5 minutes
Materials:
- Projected snapshot of the first 7 days from the Mystery Data Set
Instructions:
- Review the AQI values for Days 1–7.
- On your paper, record TWO quick observations about the data.
- Observation 1:
- Observation 2:
- Write ONE possible explanation (hypothesis) for a pattern you notice.
- Turn to an elbow partner, share your observations and hypothesis, and add one new idea from your partner.
Purpose: This rapid exercise activates prior knowledge of data interpretation, sharpens observation skills, and prepares students for deeper analysis in the Science Sleuths Worksheet.


Cool Down
Sleuth Reflection Exit Ticket
Name: ____________________________ Date: _______________
Take a few minutes to reflect on today’s Science Sleuths investigation.
-
One evidence-based conclusion from today’s data (cite at least one data point):
-
Which TWO specific AQI values or patterns most strongly support your conclusion?
a.
b.
-
One new scientific question you have after this investigation:
-
How did the process of observation → hypothesis → analysis → conclusion help you think like a scientist?

