A medical researcher, studying the effective durations of three over-the-counter

Question

A medical researcher, studying the effective durations of three over-the-counter pain relievers, obtains the following boxplots from three equal-sized groups of patients, one group using each of the pain relievers. Which of the following is a correct statement with regard to comparing the effective durations in minutes of the three pain relievers? (A) All three have the same interquartile range. (B) More patients had over 210 minutes of pain relief in the (I) group than in either of the other two groups. (C) More patients had over 240 minutes of pain relief in the (I) group than in 28 either of the other two groups. (D) More patients had less than 120 minutes of pain relief in the (III) group than in either of the other two groups. (E) The durations of pain relief in the (II) group form a normal distribution.

Explanation / Answer

Answer (b) More patients had over 210 minutes of pain relief in group (1) than in either of the upper two groups.

Reason only group has its upper quartile over 210 minutes, the other two groups have their upper quartile at less than 210 minutes.

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