Question

Chapter 2, Section 2, Exercise 069 Donating Blood to Grandma? Can young blood help 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 studies2 measured exercise endurance using maximum treadmill runtime in a 90 minute window. The number of minutes of runtime are given in the table below 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 27 28 31 35 39 40 45 Young 46 55 56 59 68 76 90 90 90 90 Old 19 21 22 25 28 29 29 31 36 42 50 51 68 Round your answers to two decimal places. (a) Calculate Ty, the mean number of minutes on the treadmill for those mice receiving young blood

Answer 1