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Chapter 1: Q 1.3. (page 7)
Identify some methods used in descriptive statistics.
Construction of charts, graphs, and tables, calculation of averages, the measure of variation and percentile, etc are some of the methods used in descriptive statistics.
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Which of the following sampling procedures involve the use of probability sampling?
a . A college student is hired to interview a sample of voters in her town. She stays on campus and interviews 100 students in the cafeteria.
b . A pollster wants to interview 20 gas station managers in Balti more. He posts a list of all such managers on his wall, closes his eyes, and tosses a dart at the list 20 times. He interviews the people whose names the dart hits
The members of a population are numbered 1-4.
(a). List the 6 possible samples (without replacement) of size 2 from this population.
(b). If an SRS of size 2 is taken from the population, what are the chances of selecting 2 and 3? Explain your answer.
(c). Use Table I in Appendix A to obtain an SRS of size 2 from the population. Start at the single-digit number in line number 17 and column number 7, read down the column, up the next, and so on.
In each of Exercises 1.55-1.58, fill in the blank (s).
Systematic random sampling is easier to execute than simple random sampling and usually provides comparable results. The exception is the presence of some kind of in the listing of the members of the population.
The members of a population are numbered 1-90.
(a). Use Table I in Appendix A to obtain SRS of size 5 from the population. Start at the two-digit number in line number 15 and column numbers 25-26, read down the column, up the next, and so on.
(b). If you have access to a random-number generator, use it to solve part (a).
In Exercises 1.92-1.97, we present descriptions of designed experiments. In each case, identify the
(a) experimental units
(b) response variable
(c) factor (s)
(d) levels of each factor:-
(e) treatments.
Increasing Unit Sales. Supermarkets are interested in strategies to increase temporarily the unit sales of a product. In one study, researchers compared the effect of display type and price on unit sales for a particular product. The following display types and pricing schemes were employed.
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