In order to conduct the study, 12 chain stores were randomly selected and divided into three groups of four stores. Strategy 1 was used in four stores, strategy 2 in four others, and strategy 3 in the...

In order to conduct the study, 12 chain stores were randomly selected and
divided into three groups of four stores. Strategy 1 was used in four stores,
strategy 2 in four others, and strategy 3 in the remaining four stores. The
allocation of strategy to stores was made randomly. The amount of sales (in
RM 000’s) during a month at each of the twelve stores were recorded. It is
known that the monthly sales in all stores are approximately normally
distributed.

Test the claim that the standard deviation of sales between stores with
the strategy I and II are the same at 5% significance level.

Extracted text: Strategy III (prizes for purchases above certain amount) Strategy I (Voucher) Strategy II (Discounts) Observation 1 96 135 160 Observation 2 129 131 150 Observation 3 135 129 148 Observation 4 115 120 127 Mean 118.75 128.75 146.25 Standard Deviation 17.3277 6.3443 13.8654 Source of Variation Treatment Total SS 1550 3148.25