A Professor Computes the Mean Difference in Exam Scores Before

question 63

Multiple Choice

A professor computes the mean difference in exam scores before and after a lecture as 9.0±14.5 ( ) ,and this difference was significant.What is the effect size for this result using estimated Cohen's d?

• A)d = 0.62 (medium effect)
• B)d = 1.61 (medium effect)
• C)d = 0.62 (large effect)
• D)d = 1.61 (large effect)

---

Definitions:

Profit Maximizers

Refers to firms or individuals who alter their production or operational levels to achieve the highest possible profit margins.

Lump Sum Subsidy

A fixed amount of money provided by the government or a body to support a business or market, which does not change with the level of output.

Per-Unit Subsidy

A financial incentive given by the government, reducing the cost of each unit of a good or service to either the producer or consumer.

Profit Maximization

A business objective to achieve the highest possible profit from operations, often by adjusting production, prices, and other variables.