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Chapter 1: Q 4. (page 31)
Before planning and conducting a study to obtain information, what should be done?
Literature study is a must before planning and conducting a study.
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In this section, we discussed two types of statistical designs. Identify and explain the meaning of each one.
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.
In a designed experiment, there is one factor with four levels. How many treatments are there?
In a designed experiment, there are two factors, say, Factor Aand Factor B. Factor Ahas four levels, say, ; Factor B has two levels, say,.
(a) Construct a schematic for the treatments similar to Table 1.8 on page 27.
(b) Use part ( a ) to determine the number of treatments.
(c) Could you have determined the answer for part ( b ) without constructing the schematic in part ( a )? Explain your answer.
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.
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