Complete the following:
Q1: What type of study design is described in the abstract?
a. Observational
b. Case Control
c. Retrospective
d. Cross Sectional
e. a and c
Q2: What proportion of patients was successfully treated?
68.9
Q3: Calculate a 95% Confidence Interval (CI) for the true population proportion with successful treatment. Hint: The SE of p is the square root of (pq)/n.
Upper limit CI = _____
Lower Limit CI = _____
Q4: Which of the following is true with regard to the confidence interval computed in Question 3 above:
a. 95 times out of 100 one would expect a the sample of 399 taken from the same population to have a proportion of successfully treated patients to be between the upper and lower limits of the confidence interval computed in Question 2.
b. 95 times out of 100 one would expect a the sample of 399 taken from the same population to have a proportion of successfully treated patients to be outside the upper and lower limits of the confidence interval computed in Question 2.
c. 5 times out of 100 one would expect a the sample of 399 taken from the same population to have a proportion of successfully treated patients to be outside the upper and lower limits of the confidence interval computed in Question 2.
d. a and c.
Q5: Using the information from Table 1, construct a 3 x 2 table to test the association between DOT status and successful treatment.
Observed Treatment Success
|
DOT
|
Yes
|
No
|
Total
|
|
Yes
|
|
|
250
|
|
No
|
|
|
146
|
|
Unknown
|
|
|
3
|
|
Total
|
275
|
124
|
399
|
Generate the expected values for the empty cells below. Hint: the expected value for any cell is the row total x column total divided by the grand (overall) total.
Expected Treatment Success Values
|
DOT
|
Yes
|
No
|
Total
|
|
Yes
|
|
|
250
|
|
No
|
|
|
146
|
|
Unknown
|
|
|
3
|
|
Total
|
275
|
124
|
399
|
Q6: Using the DOT status groups, generate the chi-squared test statistic, by hand, using a calculator, or using a computer.
Alpha = 0.05
df = _____
Critical value = _____
Chhi-squared test statistic = _____
Based on comparing the Chi square statistic to the critical value which of the following is true?
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.
Q7: Which independent variables listed below is (are) positively significantly associated with successful treatment?
a. Institutions
b. Physician
c. DOT
d. CXR
e. a, b, and c.
Attachment:- Tests of Association for Categorical Data.rar