statistical and other software to analyze large databases to discover hidden patterns in
the data.
An experiment was conducted to test the effects of coupon value on redemption.
Personal interviews were conducted in New York with 280 shoppers who were entering
a supermarket. These shoppers were given a coupon for one of four brands prior to
entering the store. Two coupon values were used, one offering 15-cents off and the
other 50-cents off. Shoppers were randomly assigned to these two coupon-value levels.
Four brandsTide detergent, Kellogg’s corn flakes, Aim toothpaste, and Joy liquid
dishwashing detergent were used. These same shoppers were re-interviewed upon
leaving the store and asked to report on any coupons used in the store. What extraneous
variable most likely will influence the results of this experiment?
A) maturation
B) mortality
C) statistical regression
D) history
E) testing effects
The ________ is a statistic that assumes that the variable has a symmetric bell-shaped
distribution and the mean is known, and the population variance is estimated from the
sample.