provides the most representative sample.
b. Stratified sampling is a very useful sampling technique. It allows closer examination
of the characteristics of particular subgroups. It also lowers the chance of error by
ensuring that subgroups are adequately represented in the sample. However, this
method generally produces less precise estimates of population values than simple
random samples.
c. In calculating the standard error of the mean when using a stratified sample, one finds
that differences among strata means do not enter the estimate.
d. When using proportional allocation in stratified random sampling, one samples from
each of the strata in proportion to their respective variabilities.
e. The sampling distribution of means for stratified sampling is generally less
concentrated than that obtained from simple random sampling.
After working through the first two steps of the process of problem definition, the
researcher should be in a position to state the manager’s:
a. Root problem cause.
b. Buy-in.
c. Change resistance.
d. Resolution timeframe.
e. Decision problem.