Hospital A is examining the effect of high and low intensity rehabilitation for hip replacement patients....

Hospital A is examining the effect of high and low intensity rehabilitation for hip replacement patients. Patient mobility postreplacement is based on patient self-reports and is categorized as improved, no change, or diminished. High-intensity rehabilitation is a ten-week regime; low-intensity is four weeks.

Observed	Improved	No Change	Diminished	Total
Low-Intensity Rehab	121	22	12	155
High-Intensity Rehab	143	17	9	169
Total	264	39	21	324
Marginal probability	81.5%	12.0%	6.5%


Expected	Improved	No Change	Diminished	Total
Low-Intensity Rehab
High-Intensity Rehab
Total


Chitest
Chiinv - test stat
Chiinv - critical value

Expert Solution

using excel>Addin<phtat>multiple sample test

we have

Chi-Square Test

Observed Frequencies
	Column variable			Calculations
Observed	Improved	No Change	Diminished	Total	fo-fe
Low-Intensity Rehab	121	22	12	155	-5.2963	3.342593	1.953704
High-Intensity Rehab	143	17	9	169	5.296296	-3.34259	-1.9537
Total	264	39	21	324

Expected Frequencies
	Column variable
Expected	Improved	No Change	Diminished	Total	(fo-fe)^2/fe
Low-Intensity Rehab	126.2963	18.65741	10.0463	155	0.222103	0.598847	0.379937
High-Intensity Rehab	137.7037	20.34259	10.9537	169	0.203704	0.549238	0.348463
Total	264	39	21	324

Data
Level of Significance	0.05
Number of Rows	2
Number of Columns	3
Degrees of Freedom	2

Results
Critical Value	5.991465
Chi-Square Test Statistic	2.302291
*p-Value*	0.316274
Do not reject the null hypothesis

Observed	Improved	No Change	Diminished	Total
Low-Intensity Rehab	121	22	12	155
High-Intensity Rehab	143	17	9	169
Total	264	39	21	324
Marginal probability	81.5%	12.0%	6.5%


Expected	Improved	No Change	Diminished	Total
Low-Intensity Rehab	126.2963	18.65741	10.0463	155
High-Intensity Rehab	137.7037	20.34259	10.9537	169
Total	264	39	21	324

Chitest
Chiinv - test stat	5.9912
Chiinv - critical value	2.302

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