A researcher investigated the relationship between weekly dietary sugar intake (in grams) and cognitive focus. A sample of 40 university students were asked to keep a retrospective food diary at the end of each week, writing down every sugary snack and beverage consumed and estimating the total sugar content in grams. The researcher also measured each student's cognitive focus using a computerized reaction-time test in a controlled lab environment. The findings showed a significant negative correlation between estimated weekly sugar intake and cognitive focus. A health website published these findings under the headline: 'Sugar completely ruins your concentration'.
Explain one problem with the method used to determine the weekly sugar intake. Suggest an alternative measure that would overcome this problem.
38 exam-style questions on AQA A Level Psychology Self-report techniques. Each one has a worked solution and a mark scheme showing where the marks go.