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

question 9

Essay

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} { l l } \text {Preservative \(A\)}& \text { Preservative \(B\)}\\X _ { I } = 106.4 \text { hours } & X _ { \text {II } } = 96.54 \text { hours } \\S _ { I } = 10.3 \text { hours } & S _ { \text {II } } = 13.4 \text { hours }\end{array}$$


-Referring to Table 10-3, what is the critical value for testing if the population variances differ for preservatives I and II at the 5% level of significance?

Recognize and apply basic PLC (Programmable Logic Controller) programming instructions such as OTE, OTL, and XIC.

Understand the role and operation of actuators and their applications.

Grasp the concept of interlocking circuits and their importance in controlling processes.

Comprehend the operation and use of servo motors and stepper motors in control systems.

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Definitions:

Investment Return

The gain or loss on an investment over a specified period, expressed as a percentage of the investment's cost.

Interest Rate

The percentage charged by lenders to borrowers for the use of money, typically expressed at an annual rate.

Economic Profit

The difference between total revenues earned by a firm and its total opportunity costs.

Investment Return

The increase or decrease in the value of an investment during a certain period, represented as a percentage of the original investment's price.