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Repeat Trials and Data Reliability 4 questions

Repeat Trials and Data Reliability

New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.

Repeating a trial under the same conditions helps assess consistency. The range is the largest measurement minus the smallest.

Question 1

Which action measures repeatability in a timed dissolving test?

  1. Run the same test again under the same conditions.
  2. Change water temperature each time.
  3. Use a different solute in every trial.
  4. Report only the first measurement.

Question 2

Three trials take 9 s, 10 s, and 11 s. Calculate their mean and range.

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Question 3

Which set of times has the smallest range?

  1. 8 s, 10 s, 13 s
  2. 10 s, 11 s, 11 s
  3. 7 s, 10 s, 12 s
  4. 6 s, 9 s, 14 s

Question 4

One of four trials takes much longer than the others. Explain what to check before deciding how to use that reading.

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Comparing Measurement Records 4 questions

Comparing Measurement Records

Use the information below to answer the questions.

A class measures the time for the same mass of a solid to dissolve under two stirring conditions. The samples, water temperature, and water volume are held constant.

ConditionTrial 1 (s)Trial 2 (s)Trial 3 (s)Trial 4 (s)
A18192019
B14132615

Question 5

Which condition gives more consistent trial times based on range?

  1. A
  2. B
  3. Both have the same range.
  4. Range cannot be found from the table.

Question 6

Which measurement in B should the class investigate first? Use the other B readings to explain.

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Question 7

Calculate B’s mean including all four trials, then calculate the mean of its three shorter times. Include units.

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Question 8

Which next test would best help investigate whether B’s unusual reading repeats?

  1. Repeat B under the same conditions.
  2. Use warmer water with B only.
  3. Switch B to a different solid.
  4. Change both conditions and compare with the old results.

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