IQ Scores for a Population-Based Sample Usually Fall into a __________

question 54

Multiple Choice

IQ scores for a population-based sample usually fall into a __________ or __________ curve, in which most people fall near the middle and the proportions decrease at the low and high extremes.

• A)normal distribution; bell
• B)camelback; double hill
• C)inverted-U; inverted-V
• D)variance from the mean; absolute value

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Definitions:

Level Of Significance

A threshold in hypothesis testing that determines whether or not the null hypothesis can be rejected.

Null Hypothesis

A default premise stating no statistical significance or effect, used as a starting point for hypothesis testing to be either rejected or not rejected.

Z Statistic

A statistical measure that quantifies the distance (in standard deviation units) a data point is from the mean of a data set.

Normal Distribution

Normal Distribution is a continuous probability distribution characterized by a symmetric, bell-shaped curve, where mean, median, and mode are equal.