1. A normal population distribution is needed for the
following statistical
tests:
a. chisquared
b. variance estimation
c. standard error of the mean
d. Student's ttest
e. Kendall's rank coefficient.
2. With regard to statistics:
a. the mode is the most frequently occurring
value
b. the mode is the maximum point on a frequency distribution
curve.
c. the median has an equal number of values above and
below
it
d. in a normal distribution the mean, mode and median
coincide
e. about 95% of observations lie within two standard
deviations of the mean
3. With regard to the chisquared test:
a. it is used to test the difference between
frequencies
b. it is used as an alternative to the ttest to determine
the
difference between two means
c. the number of degrees of freedom is the number of
independent comparisons.
d. the greater the value of the chisquared test, the
less likely it
is to be significant
e. the null hypothesis is not required.
4. The prevalence rate of a disease has the following features:
a. it is dependent on the incidence of the disease
b. it is dependent on the duration of illness
c. it measures all the current cases in the community
d. it can be estimated from a crosssectional study
e. it can be used to determine the health needs of a community
5. An aetiological factor must satisfy the following
before one can say that it
is causally related to a disease:
a. exposure to the factor must precede the development
of the
disease
b. elimination of the factor decreases the risk of the
disease
c. the factor is found more frequently among the diseased
than
nondiseased
d. the factor is not found among persons without the disease
e. the factor is found in all cases with the disease
