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Practical and data skills

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Which is an independent repeat of an enzyme reaction?

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A 1.0 mol dm-3 stock is diluted tenfold, then the diluted solution is diluted tenfold again. What is the final concentration?

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Which display is most appropriate for comparing mean leaf length among three named plant species?

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An endpoint is reached in 50 s in trial A and 100 s in trial B, with the same initial amount and endpoint. How do their relative rates compare?

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What happens to the standard deviation if the same 2 cm calibration error is added to every observation?

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A four-category cross is tested against a fixed 9:3:3:1 expectation. What degrees of freedom apply to the specified one-row test?

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Which situation matches an unpaired t-test?

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A balance reads every mass 0.20 g too high. Which action directly addresses the problem?

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Write a short answer, then compare it with a sample and check for missing ideas.

Question 1 of 8

Repair a confounded comparison

Plan how to investigate the effect of pH on catalase reaction rate. Include a measured response, three controlled variables with methods, independent repeats, a relevant control treatment and one hazard with a matching precaution.

Question -> measurements -> fair comparison -> repeat -> analysis; connect a precaution to an actual hazard.

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