EXAM 3 (4/26)

Question 1

probability sample

Answer 1

a sample selected such that each item or person in the population being studied has a known likelihood of being included in the sample

Question 2

simple random sample

Answer 2

a sample formulated so that each item or person in the population has the same chance of being included

Question 3

systematic random sampling

Answer 3

the items or individuals of the population are arranged in some order. A random starting point is selected and then every kth member of the population is selected for the sample

Question 4

stratified random sampling

Answer 4

a population is first divided into subgroups, called strata, and a sample is selected from each stratum

Question 5

cluster sampling

Answer 5

a population is first divided into primary units then samples are selected from the primary units

Question 6

nonprobability sample

Answer 6

inclusion in the sample is based on the judgement of the person selecting the sample

Question 7

sampling error

Answer 7

difference between a sample statistic and its corresponding population parameter

Question 8

sampling distribution of the sample mean

Answer 8

a probability distribution consisting of all possible sample means of a given sample size selected from a population

Question 9

margin of error

Answer 9

how much of a difference you can expect between any possible sample mean and the true population mean most of the time