13. Which of the following sampling methods does not lead to the samples that ca
ID: 3043042 • Letter: 1
Question
13. Which of the following sampling methods does not lead to the samples that can represent population?
convenience sampling
cluster sampling
stratified sampling
systematic sampling
14. Stratified random sampling is a method of selecting a sample in which
the sample is first divided into strata, and then random samples are taken from each
stratum
various strata are selected from the sample
the population is first divided into strata, and then random samples are drawn from each
stratum
None of these alternatives is correct.
2
OMG321 Quiz 1 Prof. Jian-yu Fisher Ke
15. Random samples of size 81 are taken from an infinite population whose mean and standard deviation are 200 and 18, respectively. The distribution of the population is unknown. The mean and the standard error of the mean are (assuming infinite population)
200 and 18
81 and 18
9 and 2
200 and 2
16. A population has a mean of 300 and a standard deviation of 18. A sample of 144 observations will be taken. The probability that the sample mean will be between 297 to 303 is (assuming infinite population)
0.4332
0.8664
0.9544
0.0668
Explanation / Answer
13. Convenience sample doesn't represent the population.
Option A is correct.
14. In stratified sampling, the population is first divided into strata, and then random samples are drawn from each stratum.
Option C is correct.
15. Mean = population mean = 200
Standard error = 18/sqrt(81) = 18/9 = 2
Option D is correct.
16. P(Sample mean between 297 and 303)
= P(-2 < z < 2)
= 0.9544
Option C is correct.
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