In a stratified sample with five strata, each comprising 1/5 of the population, the sample mean for each stratum will receive what weight when calculating the overall sample mean?
a. 1.20
b. 0.20
c. 0.15
d. 1.00
e. Cannot be determined with information given in the question.
Question 2
The essential difference between a confidence interval constructed employing a stratified sample and that constructed employing a simple random sample is that with the stratified sample
a. a point estimate of the population mean is not required.
b. determination of the estimate of the mean and standard error of estimate involves the use of weights.
c. the strata results are appropriately weighted by a method of curvilinear estimation.
d. inferences are drawn on the basis of the known population mean and variance.
e. the researcher does not need to specify the degree of confidence.
Sample Problem from Raven’s Progressive Matrices
population
Sample Program for Changing Daily Caloric Intake (cont.)
Some Cases of Population Aging
The population of a city has continued to grow since 1950.
Predicted Proportions in a Population