The degenerative disease osteoarthritis most frequently affects weight bearing j

Question

The degenerative disease osteoarthritis most frequently affects weight bearing joints such as the knee. An article presented the following summary data on stance duration (ms) for samples of both older and younger adults Age Older Yaunger Sample Size 26 16 Sample Mean 801 770 Sample SD 118 75 Assurne that both stance duration distributions are normal (3) Calculate a 99% CI for true average stance duration among elderly individuals. Interpret your 99% CI, with 99% confidence, we can say that the true average stance duration among elderly individuals falls outside these values. with 99% confidence, we can say that the true average stance duration among elderly individuals falls below the lower bound. with 99% confidence, we can say that the true average stance duration among elderly individuals falls between these values. with 99% confidence, we can say that the true average stance duration among elderly individuals falls above the upper bound. 0 erry out a test o hypotheses at significance level 0.05 to decide whether true average stance duration i larger among elderly individuals than among younger individuals. Use 1 for elderly individuals and 2 or younger individ State the relevant @ Hg: 1-P2-0 Calculate the test statistic and deterrnine the P-value. (Round your test staistic to two decimal places and your P-value to three decimal places.) P-value

Explanation / Answer

The statistical software output for this problem is:

Two sample T summary confidence interval:
1 : Mean of Population 1
2 : Mean of Population 2
1 - 2 : Difference between two means
(without pooled variances)

99% confidence interval results:

Hypothesis test results:

Hence,

a) 99% CI: (- 49.558, 111.558)

t = 1.04

P - value = 0.152

Difference Sample Diff. Std. Err. DF L. Limit U. Limit 1 - 2 31 29.78424 39.922684 -49.558026 111.55803

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