There is some evidence that "young blood" might improve the health, both physically and cognitively, of elderly people (or mice). Exercise 2.69 on page 75 introduces one study in which old mice were randomly assigned to receive transfusions of blood from either young mice or old mice. Researchers then measured the number of minutes each of the old mice was able to run on a treadmill. The data are stored in YoungBlood. We wish to estimate the difference in the mean length of time on the treadmill, between those mice getting young blood and those mice getting old blood. Use StatKey or other technology to find and interpret a \(90 \%\) confidence interval for the difference in means.

Data From Exercise 3.69:

Several studies 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 number of minutes of runtime are given in Table 2.17 for the 17 mice receiving plasma from young mice and the 13 mice receiving plasma from old mice. The data are also available in YoungBlood.

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Table 2.17 Number of minutes on a treadmill Young 27 28 31 46 55 56 559 35 39 40 45 89 68 76 76 90 90 90 90 Old 19 21 22 25 28 29 29 90 29 31 36 42 50 51 68