In each of the following instances (i) tell whether the study is survey, a prospective study or a retrospective study, (ii) tell whether the study is comparative or descriptive, and (iii) if the study is comparative, identify the response and explanatory variables.
a) A sample of members listed in the directory from a professional organization is used to estimate the proportion of female members.
b) To asses the effect of smoking during pregnancy on premature delivery, mothers of preterm infants are matched by age and number of previous pregnancies to mothers of full term infants and then both are asked about their smoking habits during pregnancy.
c)A sociologist interviews juvenile offenders to find our what proportion live in foster care.
d) A marketing study uses the registration card mailed back to the company following the purchase of a VCR to gauge the percentage of purchasers who learned about that brand from advertising on radio, television, periodicals, or by word of mouth.
a) Retrospective study, Descriptive,
b)Survey , Comparative, Explanatory variable- Smoking habbit & Response variable- premature delivery
c) Survey, Comparative, Explanatory variable- Juvenile offenders & Response variable- live in foster care
d) Prospective study , Descriptive
In each of the following instances (i) tell whether the study is survey, a prospective study...