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Chapter 16 Quiz - Sampling Methods
Compute the stratified estimate of the mean.
Compute the standard error of the stratified estimate of the mean.
An employment agency wants to estimate the mean income of recent graduates from a business college who major in Marketing, Finance, Accounting, and Economics. The number of graduates each year from each strata is as follows: Marketing-35; Finance-55; Accounting-40; and Economics-25. A random sample of 62 graduates is selected, with proportional allocation. The sample results are as follows:
Give a stratified estimate of the mean income of recent graduates of that college.
A survey is conducted to find the proportion of qualified electricians out of workers who were doing electrical work and were qualified electricians employed in steel plants over the northeastern region. Five nearby steel plants from a total of 32 in the region are selected.
Estimate the proportion of electricians among the electrical workers in the steel industry.
To find the number of people traveling per car in the evening between 5:00 pm and 6:00 pm on a particular highway, every fifteenth car in a lane is sampled. The first car to be sampled is chosen at a random instant in time. The following data is obtained:
2, 1, 1, 3, 1, 1, 2, 4, 1, 2, 1, 3, 2, 1, 2, 1, 1, 1, 3, 1, 1, 4, 1, 1, 1
Assume that 600 cars pass through that lane during the time.
Compute the systematic sampling estimator of the population mean.