y Nates Ask Your As the population ages, there is increasing concern about accid
ID: 3371530 • Letter: Y
Question
y Nates Ask Your As the population ages, there is increasing concern about accident-related injuries to the elderly. An article reported on an experiment in which the maximum lean angle-the farthest a subject is able to lean and still recover in one step-was determined for both a sample of younger females (21-29 years) and a sample of older females (67-81 years). The following observations are consistent with summary data given in the article YF: 29, 34, 33, 27, 28, 32, 31, 34, 32, 27 OF: 18, 14, 23, 13, 1 Does the data suggest that true average maximum lean angle for older females (OF) is more than 10 degrees smaller than it is for younger females (YF)? State and test the relevant hypotheses at significance level 0.10. (Use ? 1 for younger females and ?2 for older females.) Hai ??-?2 10 Calculate the test statistic and determine the P-value. (Round your test statistic to two decimal places and your P-value to three decimal places.) pvalue State the conclusion in the problem context. O Reject Ho. The data suggests that true average lean angle for older females is not more than 10 degrees smaller than that of younger females. o Fail to reject Ho. The data suggests that true average lean angle for older females is not more than 10 degrees smaller than that of younger females. o Fail to reject Ho. The data suggests that true average lean angle for older females is more than 10 degrees smaller than that of younger females. O Reject Ho. The data suggests that true average lean angle for older females is more than 10 degrees smaller than that of younger females.Explanation / Answer
The statistical software output for this problem is:
Two sample T hypothesis test:
?1 : Mean of YF
?2 : Mean of OF
?1 - ?2 : Difference between two means
H0 : ?1 - ?2 = 10
HA : ?1 - ?2 > 10
(without pooled variances)
Hypothesis test results:
Hence,
Hypotheses: Option C is correct.
t = 2.13
P - value = 0.040
Conclusion: Option D is correct.
Difference Sample Diff. Std. Err. DF T-Stat P-value ?1 - ?2 14.7 2.2037846 5.5289661 2.1326948 0.0404Related Questions
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