A Random Sample of 250 Students at a University Finds $15.4$

question 70

Multiple Choice

A random sample of 250 students at a university finds that these students take a mean of $15.4$ credit hours per quarter with a standard deviation of $1.7$ credit hours. The $90 \%$ confidence interval for the mean is $15.4 \pm 0.177$ . Interpret the interval.

• A) We are \(90 \%\) confident that the average number of credit hours per quarter of students at the university falls in the interval \(15.223\) to \(15.577\) hours.
• B) The probability that a student takes \(15.223\) to \(15.577\) credit hours in a quarter is \(0.90\).
• C) We are \(90 \%\) confident that the average number of credit hours per quarter of the sampled students falls in the interval \(15.223\) to \(15.577\) hours.
• D) \(90 \%\) of the students take between \(15.223\) to \(15.577\) credit hours per quarter.

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Definitions:

Demand For Labor

The total amount of workers that employers are willing and able to hire at a given wage rate in the labor market.

Variable Inputs

Factors of production that can be adjusted in the short term to change the level of output, such as labor or raw materials.

Production Process

The sequence of steps or operations involved in the production and manufacture of goods or services, transforming inputs into finished products.

Supply Of Labor

The total hours that workers are willing and able to work at a given wage rate.