MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Maintaining your balance may get harder as you grow older. A study was conducted to see how steady the elderly are on their feet. They had a random sample of 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 are in the table below. Do the data show that the mean elderly sway measurement is higher than the mean forward sway of younger people, which is 18.125 mm? Test at the 1% level.

forward sway in mm
34
30
31
34
24
25
22
33
33
17
19
29
30
31
24
33
27
26
26
30
17
17
15
41
48
34
15
36
20
9
34
12
13
34
14
29
39
33
11
20
25
29
23
27

 

A:  Assumptions

     Since     information was collected from each object, what conditions do we need to check?

     Check all that apply.

    

  • n(pˆ)≥10n(p̂)≥10
  • np≥10np≥10
  • n(1−p)≥10n(1-p)≥10
  • σσ is unknown
  • n(1−pˆ)≥10n(1-p̂)≥10
  • σσ is known
  • n≥30n≥30 or normal population
  • N≥20nN≥20n
  • no outliers in the data
  • outliers in the data


     Check those assumptions:

     1. Is the value of σσ known?    

 

     2. Given the following modified boxplot (If using a screenreader, use technology to generate a boxplot, then asnwer the question below):

         

(5101520253035404550forward sway in mm919.5273348[Graphs generated by this script: setBorder(15); initPicture(5,50,-3,6);axes(5,100,1,null,null,1,'off');text([24.5,-3],"forward sway in mm");line([9,2],[9,4]); rect([19.5,2],[33,4]); line([27,2],[27,4]);line([48,2],[48,4]); line([9,3],[19.5,3]); line([33,3],[48,3]);fontsize*=.8;fontfill='blue';text([9,4],'9','above');text([19.5,4],'19.5','above');text([27,4],'27','above');text([33,4],'33','above');text([48,4],'48','above');fontfill='black';fontsize*=1.25;])

          Are there any outliers?            

     3. nn =  which is     

          Is it reasonable to assume the population is normally distributed?          

N: Name the test

     The conditions are met to use a        .

T: Test Statistic

     The symbol and value of the random variable on this problem are as follows:

                =  mm

     The test statistic formula set up with numbers is as follows:

     Round values to 2 decimal places.

t=¯¯¯X−μs√n=t=X¯-μsn=

(((( −-  )) //  /√/  )))) 

     The final answer for the test statistic from technology is as follows:

     Round to 2 decimal places.

     t = 

O: Obtain the P-value

     Report the final answer to 4 decimal places.

     It is possible when rounded that a p-value is 0.0000

     P-value = 

M: Make a decision

     Since the p-value          , we        .

S: State a conclustion

     There     significant evidence to conclude                mm

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