The Use of Preservatives by Food Processors Has Become a Controversial

question 186

Multiple Choice

The use of preservatives by food processors has become a controversial issue. Suppose 2 preservatives are extensively tested and determined safe for use in meats. A processor wants to
Compare the preservatives for their effects on retarding spoilage. They will choose to use the
Preservative that can keep the meat fresh for the longest amount of time. Suppose 15 cuts of
Fresh meat are treated with preservative I and 15 are treated with preservative II, and the number
Of hours until spoilage begins is recorded for each of the 30 cuts of meat. Suppose the variability
Of the number of hours until spoilage is the same for meat treated by both preservatives but the
Normal probability plots reveal that the number of hours until spoilage is right-skewed for the 15
Cuts treated by preservative I and left-skewed for the 15 cuts treated with preservative II. Which
Of the following tests will be the most appropriate?

• A) Pooled-variance t test.
• B) Paired t test.
• C) Wilcoxon rank sum test.
• D) Levene's test.

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