People who develop a deep vein thrombosis (DVT) in a leg are treated with anti-coagulants. However,...

People who develop a deep vein thrombosis (DVT) in a leg are treated with anti-coagulants. However, many of them later suffer “post-thrombotic syndrome” (PTS) (swelling, skin ulcers, etc.).

One way to help prevent this syndrome is the use of elastic compression stockings. Should the stockings be worn for two years after DVT, or is one year good enough? 518 patients were randomly assigned to wear elastic compression stockings at least 6 days a week for either one or two years.

Here are the results:

Elastic Compression Stockings

one year

two years

TOTAL

PTS occurred

51

34

85

No PTS

205

228

433

TOTAL

256

262

518

Fill in the blanks below to use a Chi-Square test to determine if the length of time makes a difference in the risk of DVT.

The Chi-Square statistic,rounded to three decimal places, is X² = .

The degrees of freedom are df = .

The P-value, rounded to three decimal places, is .

Complete your Chi-Square test for Question Number 3 by giving your conclusion in the space below.

Solutions

Expert Solution

orchestra answered 1 year ago

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Subjects

Elastic Compression Stockings	one year	two years	TOTAL
PTS occurred	51	34	85
No PTS	205	228	433
TOTAL	256	262	518