A Polygraph Test Is Sometimes Used to Detect If Someone

question 7

Essay

A polygraph test is sometimes used to detect if someone is lying, but it is generally not admissible in court because of its dubious accuracy. A polygraph test is given to 98 people, and the test is wrong for 24 of them. What is the empirical probability that the polygraph test is wrong for a randomly chosen person? What is the probability that it is right?

---

Definitions:

Variable Selling Costs

Expenses that vary directly with the volume of products sold, such as commissions and shipping fees.

Break-Even Point

The level of production or sales at which total revenues equal total costs, resulting in no profit or loss.

Variable Costs

Costs that fluctuate with the level of output or production, such as raw materials and direct labor.

Contribution Margin

The amount by which a product's sales price exceeds its variable costs. It contributes to covering fixed costs and generating profit.