Question 6
Using the DOT status groups, generate the chi-squared test statistic, by hand, using a calculator, or using a computer.
Alpha = 0.05
df = _____ (5 pts)
Critical value = _____ (5 pts)
Chhi-squared test statistic = _____ (5 pts)
Based on comparing the Chi square statistic to the critical value which of the following is true? (5 pts)
a. Successful outcome is dependent on DOT status.
b. Successful outcome is independent of 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
DOT Yes No Total
Yes 186 64 250
No 86 60 146
Unknown 3 0 3
Total 275 124 399
Expected Treatment Success Values
DOT Yes No Total
Yes 172.31 77.69 250
No 100.63 45.37 146
Unknown 2.07 .932 3
Total 275 124 399