AP Stats Chap. 2
AP Practice
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12 Terms
What is z-score
how many standard deviations something is away from the mean
What changes when you add 10 to the data set
mean, median, Q1, Q3, min, max
What stays the same when you add 10 to the data set
spread (S.D., IQR, Range)
What is the lower limit formula
Q1 - 1.5 (IQR)
What is the upper limit formula
Q3 + 1.5 (IQR)
2 standard deviations from the mean
95%
1 standard deviation from the mean
68%
3 standard deviations from the mean
99.7%
how to calculate z-score
(data value - mean) / standard deviation
IQR formula
Q3-Q1
What to enter into InvNorm
area: z score
Whichever side of the graph the date point is on
What to enter into Normal cdf
If percentage is below 50:
lower: percentage as decimal
upper: 1e99
If percentage is higher than 50
lower: -1e99
upper: percentage as decimal
