In estimating the standard deviation in the population for the formula for calculating the sample size for estimating a mean, we can use some prior knowledge about the
a. sample to estimate our standard deviation.
b. population, undertake a pilot study or estimate the range, and divide by 10.
c. population, undertake a pilot study or estimate the range, and divide by 6.
d. Either of the two; b or c would work.
e. None of the above; if you do not have the actual standard deviation, you cannot use the formula.
Question 2
Which of the following statements is most accurate regarding the relationship between sample size and the sample representativeness?
a. There is no relation between the size of a sample and the representativeness of the population from which it is drawn.
b. There is a strong positive relationship between the size of a sample and the representativeness of the population from which it is drawn.
c. You cannot have a representative sample unless the sample size is equal to or exceeds ten percent of the population.
d. Sample size determines representativeness but only if the sample plan is a probability sampling plan.
e. None of the above.
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