TABLE 10-3
the Use of Preservatives by Food Processors Has

question 138

Multiple Choice

TABLE 10-3
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. 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. The results are summarized in the table below.
$\begin{array}{ll}\text { Preservative } A & \text { Preservative } B \\ \bar{X}_{I}=106.4 \text { hours } & \bar{X}_{I I}=96.54 \text { hours } \\ S_{I}=10.3 \text { hours } & S_{I I}=13.4 \text { hours }\end{array}$
-Referring to Table 10-3, what assumptions are necessary for testing if the population variances differ for preservatives I and II?

• A) Both sampled populations are normally distributed.
• B) Both samples are random and independent.
• C) Neither A nor B is necessary.
• D) Both A and B are necessary.

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Definitions:

Pons

A crucial structure in the brainstem that plays key roles in sleep and dreaming, arousal, and coordination of movement.

Brain Stem

The central trunk of the mammalian brain, connecting the brain to the spinal cord and responsible for controlling basic functions like breathing and heart rate.

Pons

A part of the brainstem that plays key roles in regulating breathing, communication between different parts of the brain, and sensations such as hearing, taste, and balance.

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The process of inhaling and exhaling air to facilitate gas exchange with the internal environment, primarily by bringing in oxygen and flushing out carbon dioxide.