Question

A market research firm is studying the effects of price and type of packaging on sales of a particular product. Twenty-seven stores with shoppers of similar characteristics will be used in the study. The nine combinations of three price levels and three packaging types are the treatments of interest. Total sales of the product over a seven-week period will be recorded. Which of the following describes the best design to use for the study?
a. А completely randomized design Randomly assign the nine combinations of price level and packaging type that three stores use each combination
b. A completely randomized design. Randomly assign the three price levels so that nine stores use each price level
c. A completely randomized design. Randomly assign the three packaging types so that nine stores use each type of packaging
d. A randomized block design Use packaging as a block. Randomly assign the nine combinations of three price levels and three packaging types so that three stores use each combination
e. A randomized block design. Use packaging as a block Randomly assign nine stores to each packaging type, then randomly assign price level to three stores within each block.

Answer 1

d. A randomized block design use packaging as a block. Randomly assign the nine combinations of three price levels and three packaging types, using combination

By utilising a randomised block design, market research can improve the accuracy of the study's findings. RBD The market research firm should conduct the study using the following design:

In a randomised block design, or RBD, experimental units are divided into equal-sized groups or blocks, and each group is then assigned a treatment at random. The information is shielded from outside influences in this way.

In essence, an RBD is a method for organising every possible combination of variables in order to minimise outside errors. Think of the RBD as a building with floors and apartments, with each combination of elements representing a floor.

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