For the Following Question(s): a Researcher Is Interested in Whether

question 23

Multiple Choice

For the following question(s) : A researcher is interested in whether the color of an animal's surroundings affects learning rate. She tests 16 rats in a box with colorful wallpaper. Assume that it is known that the average rat can learn to run this particular maze (in a box without any special coloring) in 25 trials, with a variance of 64; the distribution is normal. The mean number of trials to learn the maze for the group with the colorful wallpaper is 11.
-What is the shape of the distribution of means?

• A)rectangular
• B)normal
• C)not rectangular, but flatter than a normal curve
• D)it cannot be determined from the information given

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Definitions:

Dividend

A portion of a company's earnings distributed to its shareholders, typically in the form of cash or additional stock.

Preferred Stock

A class of ownership in a corporation that has a higher claim on assets and earnings than common stock and typically dividends that are paid out before those to common stockholders.

Annual Dividend

The total amount of dividend payments a company makes to its shareholders over a single fiscal year.

Return

The income generated on an investment over a particular period of time, expressed as a percentage of the investment's initial cost.