A researcher investigates whether the colour of a revision app changes how long students use it. Students are randomly allocated to a blue version or an ora...
Question 1 Report
A researcher investigates whether the colour of a revision app changes how long students use it. Students are randomly allocated to a blue version or an orange version, but some have already used similar apps.
(a) Name one participant variable in this study. [1]
(b) Explain why previous use of revision apps could be a confounding variable. [2]
(c) Describe one method the researcher could use to control this variable. [2]
(d) Which type of variable is the colour of the app? [1]
Answer Details
(a) Previous experience of revision apps / familiarity with app technology [1] (b) Previous experience may affect time spent using the app [1] and may differ between colour conditions, so colour is not the only explanation for the results [1] (c) Any one: ask about prior use and distribute experienced users equally between conditions [1]; or exclude previous users / use matched pairs [1] (d) Independent variable [1]
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