Prerequisite bridge, model and guided practice

Read before evaluating a comparison

Target: Decide whether a comparison isolates sleeve performance. Prerequisites: read units/time, distinguish starts and changes, subtract whole numbers. If needed use Read Temperature Data Before Explaining It or the support below: 10→14°C is 4°C warming; 30→26°C is 4°C cooling.

First name the question. To compare complete sleeve designs, keep other relevant conditions matched. To investigate a single sleeve feature, vary that feature while keeping the rest of the sleeve design matched too. A confound is another relevant difference that prevents assigning the result to the intended factor alone.

Imagined setup cards for a paper comparison of complete sleeve designs. No results supplied.

Planned comparison conditions

Constructed teaching data: these values were invented for this activity, not collected in an experiment.

Condition	Sleeve A	Sleeve B
Water mass	100 g	100 g
Start	10°C	10°C
Cup and lid	Cup C + lid L	Cup C + lid L
Time / room	20 min / 22°C	20 min / 22°C
Reading method	Same method	Same method

1. What is being compared? What would be measured? Name two conditions kept the same.

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2. Would changing both the sleeve and water mass still isolate sleeve performance? Explain.

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Two things changed

Room 22°C, same 15-minute exposure, matching cups/lids and thermometer procedure. Two complete sleeve designs; water masses and starts differ.

A flawed sleeve comparison

Constructed teaching data: these values were invented for this activity, not collected in an experiment.

Setup	Water mass (g)	Start (°C)	After 15 min (°C)
Sleeve A	100	8	14
Sleeve B	200	10	13

1. Find both temperature changes. Can the difference be assigned to the sleeve alone? Explain.

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2. Name the confounds. Propose actual matching conditions for a better sleeve comparison.

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3. What descriptive conclusion is still possible? Does comparing changes repair the confounds?

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Guided practice · Repair setup cards

Paper plans, not collected readings. The question asks which complete sleeve better limits warming.

Two proposed setups

Constructed teaching data: these values were invented for this activity, not collected in an experiment.

Condition	Sleeve C	Sleeve D
Water mass / start	100 g / 10°C	100 g / 10°C
Cup	Cup C	Cup D
Lid	Lid L	No lid
Time / room	20 min / 22°C	20 min / 22°C
Reading method	Same method	Same method

1. Identify what differs besides sleeve design. Explain why that matters.

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2. Rewrite D’s setup to match C’s relevant conditions while still comparing sleeves C and D.

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3. Give a consistent measurement and recording plan, including repeated trials. If the question were about one sleeve material, what else would need matching?

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