An Educational Organization in California Is Interested in Estimating the Mean

question 23

Multiple Choice

An educational organization in California is interested in estimating the mean number of minutes per day that children between the age of 6 and 18 spend watching television per day. A previous study showed that the population standard deviation was 21.5 minutes. The organization selected a random sample of n = 200 children between the age of 6 and 18 and recorded the number of minutes of TV that each person watched on a particular day. The mean time was 191.3 minutes. If the leaders of the organization wish to develop an interval estimate with 95 percent confidence, what will the margin of error be?

• A) Approximately ±1.52 minutes
• B) About ±2.98 minutes
• C) z = 1.96
• D) Approximately ±42.14 minutes

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Definitions:

High-low Method

An approach to estimate fixed and variable costs by using the highest and lowest levels of activity.

Monthly Production Volume

The total amount of goods produced by a manufacturer within a one-month period, indicating the scale of operations.

Total Cost

The complete cost of production, including both fixed and variable costs.

Mixed Cost

Expenses that have both fixed and variable components, changing with the level of production or sales activity.