Find the Necessary Sample Size

question 39

Multiple Choice

Find the necessary sample size.
-Scores on a certain test are normally distributed with a variance of 68. A researcher wishes to estimate the mean score achieved by all adults on the test. Find the sample size needed to assure With 95 percent confidence that the sample mean will not differ from the population mean by more Than 4 units.

• A)1111
• B)8
• C)66
• D)17

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Definitions:

Energy Diagram

A graphical representation of the energy levels of reactants and products during a chemical reaction.

Endothermic Processes

Chemical or physical processes that absorb heat energy from the surrounding environment.

Heat

A form of energy associated with the movement of atoms or molecules and capable of being transmitted through solid and fluid media by conduction, convection, or radiation.

Flashover

Flashover is a phenomenon in fire dynamics where nearly simultaneous ignition of all combustible materials in an enclosed area occurs, drastically increasing the fire spread and intensity.