The Average Number of Hours for a Random Sample of Mail

question 37

Multiple Choice

The average number of hours for a random sample of mail order pharmacists from company A was 50.1 hours last year. It is believed that changes to medical insurance have led to a reduction in the average work week. To test the validity of this belief, the hypotheses are

• A)H₀: u > 50.1, H_a: u < 50.1.
• B)H₀: u = 50.1, H_a: u = 50.1.
• C)H₀: u ≤ 50.1, H_a: u > 50.1.
• D)H₀: u ≥ 50.1, H_a: u < 50.1.

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Definitions:

Curve

A graphical representation of data points or a mathematical function on a plane, showing the relationship between two or more variables.

Normal Distribution

A chance distribution evenly balanced around the mean, revealing that instances close to the mean occur more frequently than those far from it.

Standard Deviations

A measure of the dispersion or variability within a set of data, indicating how much individual data points differ from the mean.

Mean

The average value of a set of numbers, calculated by dividing the sum of the numbers by the count of the numbers.