Young Blood Helps Old Brains Several studies1 in mice indicate that it might. In

Question

Young Blood Helps Old Brains Several studies1 in mice indicate that it might. In the studies, old mice (equivalent to about a 70-year-old person) were randomly assigned to receive blood plasma either from a young mouse (equivalent to about a 25-year-old person) or another old mouse. The mice receiving the young blood showed multiple signs of a reversal of brain aging. One of the studies measured exercise endurance using maximum treadmill runtime in a 90-minute window. The results are given in the side-by-side boxplots in the figure below. Old Young 1020304050607080” Runtime 1Sanders L, "Young blood proven good for old brain", Science News, 185(11), May 31, 2014 2Manisha s, et al., "Restoring Systemic GDF11 Levels Reverses Age-Related Dysfunction in Mouse Skeletal Muscle", Science, 9 May 2014. Values are estimated from summary statistics and graphs

Explanation / Answer

(a) Median runtime = 30 minutes.
(b) Larger than the median runtime (since in a positively skewed distributon, mean > median > mode).
(c) Young (since the maximum value is higher in the boxplot).
(d) Yes, there is association.
(e) No outliers in either group.

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