A Study Is Designed to Determine Whether Grades in a Statistics

question 67

Multiple Choice

A study is designed to determine whether grades in a statistics course could be improved by offering special review material.The 250 students enrolled in a large introductory statistics class are also enrolled in one of 20 lab sections.The 20 lab sections are randomly divided into two groups of 10 lab sections each.The students in the first set of 10 lab sections are given extra review material during the last 15 minutes of each weekly lab session.The students in the remaining 10 lab sections receive the regular lesson material,without the extra review material.The grades of the students who reviewed weekly were higher,on average,than the students who did not review every week.What type of study is this?

• A)An observational study that is a sample survey
• B)An observational study that is not a sample survey
• C)An experiment but not a double-blind experiment
• D)A double-blind experiment
• E)A matched pairs experiment

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Definitions:

Recession

A recession is an economic downturn spread across the economy lasting more than a few months, often visible in real GDP, real income, employment, industrial production, and wholesale-retail sales.

Booming Economy

A fast-growing economy characterized by rapid increases in production, sales, and typically, employment levels.

Principle of Diversification

A risk management strategy that mixes a wide variety of investments within a portfolio to minimize the impact of any single asset's performance.

Investment

An investment refers to the allocation of resources, usually money, in expectation of generating an income or profit, involving assets such as stocks, bonds, real estate, or commodities.