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Stats Chapter 5
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Terms in this set (13)
68-95-99.7 RULE
68% within 1 SD, 95% within 2 SD, and 99.7% within 3SD
NEARLY NORMAL CONDITION
the histogram of the data is unimodal and symmetric
NORMAL MODEL
Models for unimodal & symmetric distributions
NORMAL PERCENTILE
The percent of values in a Standard Normal Distribution at the z-score or below it
NORMAL PROBABILITY PLOT
display that helps assess whether a distribution is approximately normal
NORMALITY ASSUMPTION
Have to believe a variable's distribution is "Normal"
PARAMETER
a numerical value attributed to the model
RESCALE
Multiplying & Dividing to values (Everything changes)
SHIFTING
Adding & Subtracting to values (Spread stays the same)
STANDARD NORMAL MODEL
A normal model with mean = 0 and standard deviation = 1
STANDARDIZED VALUE
Value subtracted from the mean and divided by the SD
STATISTIC
a value calculated from data to summarize aspects of the data
Z-SCORE
how many standard deviations a value is from the mean
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