Stratified random sampling is a method of selecting a sample in which _____.
a. the sample is first divided into strata, and then random samples are taken from each stratum
b. various strata are selected from the sample
c. the population is first divided into strata, and then random samples are drawn from each stratum
d. None of the answers is correct.
Q. 2The value of the standard deviation may be either positive or negative, while the value of the variance will always be positive.
Indicate whether the statement is true or false
Q. 3Which of the following sampling methods is a probabilistic sampling method?
a. judgment sampling
b. convenience sampling
c. cluster sampling
d. None of the answers is correct.
Q. 4Suppose that a firm's sales were 3,750,000 five years ago and are 5,250,000 today. What was the geometric mean growth rate in sales over the past five years?
Q. 5A sample selected in such a manner that each sample of size n has the same probability of being selected is _____.
a. a convenience sample
b. a judgment sample
c. nonprobabilistic sampling
d. a simple random sample
Q. 6If a data set is composed of 5 different numbers, there are ____________________ modes.
Fill in the blank(s) with correct word
Q. 7The error that occurs because a sample, and not the entire population, is used to estimate a population parameter is a _____ error.
a. nonsampling
b. sampling
c. judgment
d. standard
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