QUESTION 2 A. They are more costly and take longer. B. There may be bias in determining the presence or absence of the s

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QUESTION 2
A.
They are more costly and take longer.
B.
There may be bias in determining the presence or absence of the
suspected factor.
C.
There may be bias in determining the presence or absence of the
resulting disease.
D.
It is more difficult to obtain controls.
E.
It is more difficult to assure comparability of cases and
controls.
QUESTION 6
A.
Country of origin rates differ from migrant rates
B.
Country of origin rates equal migrant rates
C.
Migrant rates would approximate country of adoption rates
D.
Country of origin and migrant rates will differ from country of
adoption rates
QUESTION 7
A.
Country of origin rates differ from migrant rates
B.
Country of origin rates equal migrant rates
C.
Migrant rates would approximate country of adoption rates
D.
Country of origin and migrant rates will differ from country of
adoption rates
QUESTION 11
A.
The vaccine is an excellent one because of the high rate of
immunization.
B.
No conclusion is possible, since no follow-up was made of
non-vaccinated children.
C.
The vaccine is not very effective because it should have
produced a higher immunization rate.
D.
80% is not a reliable figure and must, therefore, be
discounted.