A stratified random sample should be used when
a. the population has identifiable subgroups that are of interest to the researcher
b. the sample constitutes the population.
c. the population is very small
d. there is no way of estimating the probability that a particular subgroup will be included in the sample
Question 2
The first step in sampling is to
a. determine the desired size of the sample
b. identify the population from which the sample is to be drawn
c. identify all subgroups, or strata
d. identify desired attributes of the sample
Generalized transduction by random incorporation of bacterial DNA into phage heads
Projected Ethnic Changes in U.S. Population to 2050
Population Losses in the South, 1920–1930
Sample prescriptions of antibiotics for dental infections.
Population Indicators
Relationship between Income per Capita and Population Growth