Do I calculate the t value or variance? Im lost 32.The degenerative disease osteoarthritis most frequently affects weight-bearing joints such as the knee.The article "Evidence of Mechanical Load Redistribution at the Knee Joint in the Elderly When Ascending Stairs and RampsAnnalsof Biomed.Engr.,2008:467-476 presented the following summary data on stance duration (msfor samples of both older and younger adults Age Sample Size Sample Mean Sample SD Older Younger 28 16 801 780 117 72 Assume that both stance duration distributions are normal. a. Calculate and interpret a 99% CI for true average stance duration among elderly individuals b. Carry out a test of hypotheses at significance level 05 to decide whether true average stance duration is larger among elderly individuals than among younger individuals.