Critical Value= Chhi-Squared test statistic= Based on comparing the Chi square a

Question

Critical Value=

Chhi-Squared test statistic=

Based on comparing the Chi square and critical value which is true?

a. Successful outcome is dependent on DOT status

b. Successful outcome is independent on DOT status

c. No conclusion can be made

d. The Chi square test is invalid because of only 1 degree of freedom.

Observed Treatment Success Total DOT Yes No Unknown Total Yes No 250 146 3 399 64 60 186 86 3 275 124 Expected Treatment Success Values No Total DOT Yes No Unknown 2.067670.9323 Total Yes 172.30677.6942 100.62745.3734 250 146 3 399 275 124

Explanation / Answer

The Assumption for chi square test is

1 . our sample data is large enough then we use chi suare test i.e ( n > 5)

each value of contigency table expected value must be greater thatn 5

then we use this chi squre test

otherwise we use the fisher exat test if we have expected value is less that 5 .

And here we have given

expected value in contigency table which is less that 5 ( Ei < 5)

So here can not use chi square test of independence because assumptions are not satisfied.

no conclusion can be made

that is here option C is correct

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