An Educator Wanted to Look at the Study Habits of University

question 9

Multiple Choice

An educator wanted to look at the study habits of university students. As part of the research, data was collected for three variables - the amount of time (in hours per week) spent studying, the amount of time (in hours per week) spent playing video games and the GPA - for a sample of 20 male university students. As part of the research, a 95% confidence interval for the average GPA of all male university students was calculated to be: (2.95, 3.10) . Which of the following statements is true?

• A) In construction of the confidence interval, a t-value with 19 degrees of freedom was used.
• B) In construction of the confidence interval, a t-value with 20 degrees of freedom was used.
• C) In construction of the confidence interval, a z-value was used.
• D) In construction of the confidence interval, a z-value with 20 degrees of freedom was used. 2 Use t-Distribution

---

Definitions:

Substitution Effect

The change in consumption patterns due to a change in the relative prices of goods, leading consumers to substitute one product for another.

Income Effect

Economic principle that describes how a change in an individual's income affects their purchasing behavior.

Interest Rate

The percentage charged on a loan or paid on savings over a certain period of time, essentially the cost of borrowing money or the reward for saving.

Optimal Choice

The most efficient, advantageous selection or decision based on available information and constraints.