Maintaining your balance may get harder as you grow older.A study was conducted to see how steady the elderly is on their feet.They had the subjects stand on a force platform and have them react to a noise.The force platform then measured how much they swayed forward and backward, and the data is in table #7.3.10 ("Maintaining balance while," 2013).Do the data show that the elderly sway more than the mean forward sway of younger people, which is 18.125 mm?Test at the 5% level.

Table #7.3.10: Forward/backward Sway (in mm) of Elderly Subjects

19

30

20

19

29

25

21

24

50

Ho:

Ha:

a = 0.05

Sample Statistics:

Test Statistics:

p-value:

Conclusion:

Interpretation: