A Group of 59 Randomly Selected Students Have a Mean $\mu _ { e }$

question 83

Multiple Choice

A group of 59 randomly selected students have a mean score of 29.5 with a standard deviation of 5.2 on a placement test. What is the 90% confidence interval for the mean score, $\mu _ { e }$ , of all students taking the test?

• A) \(27.9 < \mu < 31.1\)
• B) \(28.4 < \mu < 30.6\)
• C) \(28.2 < \mu < 30.8\)
• D) \(27.8 < \mu < 31.2\)

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Gross Profit

The financial gain calculated by subtracting the cost of goods sold from total revenue.

Inventory

The total amount of goods and materials held in stock by a business, shop, or warehouse.

Administrative Expenses

Ongoing expenses associated with the general operation of a business, such as office supplies, salaries of non-sales personnel, and utilities.

Income Statement

A financial statement that shows a company's revenues and expenses over a specific period, usually a year or a quarter, highlighting the net profit or loss.