KEY TERMS

Question

common zone
extreme percentage
independence
middle percentage
normal distribution
percentile rank
probability
rare zone
standard score
z score
raw score expressed in terms of how many standard deviations it falls away from the mean; also known as a z score.
how likely an outcome is; the number of ways a specific outcome can occur, divided by the total number of possible outcomes.
percentage of the normal distribution that is found in the two tails and is evenly divided between them.
percentage of cases with scores at or below a given level in a frequency distribution.
percentage of the normal distribution found around the midpoint, evenly divided into two parts, one just above the mean and one just below it.
the section of the sampling distribution of a test statistic in which it is unlikely an observed outcome will fall if the null hypothesis is true; typically, 5% of the sampling distribution.
the section of the sampling distribution of a test statistic in which the observed outcome should fall if the null hypothesis is true; typically set to be the middle 95%.
in probability, when the occurrence of one outcome does not have any impact on the occurrence of a second outcome.
also called the normal curve; a specific bell-shaped curve defined by the percentage of cases that fall in specific areas under the curve.
raw score expressed in terms of how many standard deviations it falls away from the mean; also known as a standard score.
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