Theresult of a two-group clinical trial on mcasuring the effect of vitamin C on

Question

Theresult of a two-group clinical trial on mcasuring the effect of vitamin C on Nephropathic Cystosis (NC) is given below Clinical Improvement Yes No Vitamin C 24 8 No vitamin C 29 3 (3) (a) What kind of sampling procedure is used in this study? Explain. an- (6) (c) Test the null hypothesis using the likelihood ratio statistic. (xos)-3.84146) (d) Based on the result of the likeli hood ratio test, what conclusion you have about the loglinear model for this data? Write down the model and explain its components. (4)

Explanation / Answer

b)

null: variables are independent

alternate: not independent

c)

TS = 2.7444

TS < critical value (3.84)

we fail to reject the null hypothesis

c1 c2 total r1 24 8 32 r2 29 3 32 total 53 11 64 Oi 24 8 29 3 Ei 26.5 5.5 26.5 5.5 TS (O--Ei)^2/Ei 0.235849 1.136364 0.235849 1.136364 2.744425 critical value 3.84 p-value 0.097594155

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