DrBishop Is Studying the Effects of a Drug on Memory

question 127

Multiple Choice

Dr.Bishop is studying the effects of a drug on memory.Half of his participants will receive the drug,while the other half will receive a placebo.The pills the two groups of participants will take look exactly the same.Dr.Bishop hopes that the use of a placebo will ____.

• A) allow him to have control over the dependent variables
• B) show if memory improvement is based on participant expectations
• C) create a double-blind design for his research
• D) eliminate the chance of random variables confounding his experiment

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Definitions:

Vascular Tissue

Plant tissue responsible for the transport of water, nutrients, and sugars throughout the plant body, comprising principally of xylem and phloem.

Stomata

Tiny openings or pores in plant leaves and stems that allow for gas exchange, facilitating photosynthesis and transpiration.

Vascular Cambium

A layer of tissue in plants that is the source of new cells for growth in diameter of stems and roots.

Secondary Growth

This is the process in plants that results in the thickening of stems and roots, mainly due to the activity of the vascular cambium and cork cambium.