A University Is Studying the Proportion of Students Retained in Various

question 14

Multiple Choice

A university is studying the proportion of students retained in various years.Suppose the proportion of students retained in 2012 is $\text { P12 }$ and the proportion of students retained in 2013 is $\mathrm { P } 13$ .A study found a 90% confidence interval for $\text { P12 }$ - $\mathrm { P } 13$ is (-0.0398,0.0262) .Give an interpretation of this confidence interval.

• A)We are 90% confident that the proportion of students retained in 2012 is between 3.98% less and 2.62% more than the proportion of students retained in 2013.
• B)We know that 90% of students retained in 2013 is between 3.98% less and 2.62% more than 2012.
• C)We know that 90% of students retained in 2012 is between 3.98% less and 2.62% more than 2013.
• D)We are 90% confident that the proportion of students retained in 2013 is between 3.98% less and 2.62% more than the proportion of students retained in 2012.
• E)We know that 90% of all random samples done on the population will show that the proportion of students retained in 2012 is between 3.98% less and 2.62% more than the proportion of students retained in 2013.

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Definitions:

Variable Cost

Charges that adjust in relation to the amount of goods produced or level of enterprise activity.

Output Volume

The quantity of goods or services produced by a company, industry, or economic sector during a specified period.

Total Cost

The complete cost of producing or purchasing goods, encompassing both fixed and variable expenses.

Centre of Gravity

A method used in logistics and supply chain management to find the optimal location of a facility based on minimizing transportation costs.