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 following table ("Maintaining balance while," 2013). Table: Forward/backward Sway (in mm) of Elderly Subjects 19 30 20 19 29 25 21 24 50 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. (iv) Determine sample mean x :iv Determine sample mean x : Enter answer to nearest ten-thousandth, without units of measure. Examples of correctly entered answers: 11.2385 0.0079 3.0500 7.4000 (v) Determine sample standard deviation s :v Determine sample standard deviation s : Enter in decimal form to nearest thousandth. Do not enter units of measure. Examples of correctly entered answers: 0.002 9.050 11.300 210.715 (vi) Determine degrees of freedom df Enter answer as integer number without sign
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 following table ("Maintaining balance while," 2013).
Table: Forward/backward Sway (in mm) of Elderly Subjects
|
19 |
30 |
20 |
19 |
29 |
25 |
21 |
24 |
50 |
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.
(iv) Determine sample mean x :iv Determine sample mean x :
Enter answer to nearest ten-thousandth, without units of measure. Examples of correctly entered answers:
11.2385 0.0079 3.0500 7.4000
(v) Determine sample standard deviation s :v Determine sample standard deviation s :
Enter in decimal form to nearest thousandth. Do not enter units of measure. Examples of correctly entered answers:
0.002 9.050 11.300 210.715
Enter answer as integer number without sign
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