231q: if the birth weight of each of the babies born in a hospital in a day is found to be 2.8 kgs , then the standard deviation of the sample will be ?
a. 2.8
b. 0
c. 1
d. 0.28
232q: a diagnostic test for a particular disease has a sensitivity of a 0.90 and a specificity of 0.80 . a single test is applied to each subject in the population in which the diseased population is 30 %. What is the probability that a person negative to this test , has no disease ?
233q: according to WHO , blindness is defined as a visual acuity of the better eye , less than ?
a. 6/60
b. 5/60
c. 4/60
d. 3/60
234q: the drug of choice for treating cholera in a pregnant women is ?
a. tetracycline
b. doxycycline
c. furazolidine
d. cotrimoxazole
235q: when an intervention is applied to community to evaluate its usefulness , it is termed as a trial for
a. efficacy
b. effectiveness
c. efficiency
d. effect modification
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