John Conducted an Experiment on Whether Listening to Different Types

question 3

Multiple Choice

John conducted an experiment on whether listening to different types of music affects people's stress levels.When participants arrived at the lab,they could choose to listen to classical music,folk music,or rock music.After listening for 15 minutes,John assessed how stressed his participants were by testing their saliva for stress hormones.The major mistake that John made with his research design was

• A) He did not calculate the p-value.
• B) He used an observational method when he should have used a correlational method.
• C) He did not randomly assign his participants to conditions.
• D) He should have used a field study instead of a lab experiment.
• E) His independent variable is too complex.

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Definitions:

Project Profitability Index

A financial metric that compares the present value of a project's expected cash flows to its initial investment, used to evaluate the relative profitability of investments.

Discount Rate

The rate of interest applied in DCF evaluations to estimate the current worth of future cash inflows.

Net Present Value

The difference between the present value of cash inflows and the present value of cash outflows over a period, used in capital budgeting to assess profitability.

Sales Revenues

The total amount of money generated from sales of goods or services before any expenses are subtracted.