Identify a Comparison with One Deliberate Change - Practice 2

To investigate one factor, deliberately vary it while keeping relevant conditions alike and measuring the same outcome.

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To investigate one factor, deliberately vary it while keeping relevant conditions alike and measuring the same outcome. Repeated trials help assess variability. Matching conditions does not guarantee that every hidden factor is controlled.

Worked example

To compare light duration for similar seedlings, vary light duration while matching water, containers and measurement timing.

Would you believe it?

A rock can be weathered while staying in the same place. Transporting its loosened pieces is a separate process called erosion.

Question 1 A fictional investigation tests ramp surface. Which plan best isolates this factor? Measure a different outcome in each group. Change ramp surface while matching other relevant conditions. Change ramp surface and several other factors together.

Question 2 A fictional investigation tests filter material. Which plan best isolates this factor? Change filter material while matching other relevant conditions. Change filter material and several other factors together. Measure a different outcome in each group.

Question 3 A fictional investigation tests paper thickness. Which plan best isolates this factor? Change paper thickness and several other factors together. Measure a different outcome in each group. Change paper thickness while matching other relevant conditions.

Question 4 A fictional investigation tests salt amount. Which plan best isolates this factor? Measure a different outcome in each group. Change salt amount while matching other relevant conditions. Change salt amount and several other factors together.

Question 5 A fictional investigation tests shade cover. Which plan best isolates this factor? Change shade cover while matching other relevant conditions. Change shade cover and several other factors together. Measure a different outcome in each group.

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