A recent study examining the effects of sugar consumption on a middle school student's ability to focus on a reading assignment used 18 volunteer subjects and divided them into 9 pairs based on their reading speeds. One randomly assigned member of each pair was given a beverage containing a substantial amount of sugar, and the other drank a sugar-free version of the beverage. Each subject was given a passage to read and the time (in seconds) it took to read was recorded. The difference for each pair is calculated (sugar - sugar-free). A 90% confidence interval for the mean difference in reading times is (-5.8, 0.15).

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29 November, 08:24

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Edwin Carrillo · Answer 1

Answer: B: because the confidence interval includes 0, we don't have convincing evidence that sugar causes faster reading times on average.