AP Statistics Calculator Functions

When to use Z-test (Inferential Testing)

1 population

SD is known

sample mean is know

don’t know population mean

tests sample mean with some value

When to use T-Test (Inferential Testing)

1 sample mean is known

don’t know population mean

test sample mean with some value

When to use 2-SampleZtest (Inferential Testing)

comparing 2 means

Draw shows z-score and p-value

When to use 2SampleTtest (Inferential Testing)

Both sample means and SD are known

don’t know population mean

to test sample mean with some value

1-PropZTest (Inferential Testing)

computes a test for one proportion of sucesses

2-PropZTest (Inferential Testing)

Working with 2 populations with different values of n where both proportions of success are known

test if there is a statistical difference

Chi-Square Test (Inferential Testing)

requires observed and expected data in matrix from

Chi-Square GOF test (Inferential Testing)

simple random sampling, 1 categorical variable with an expected frequency of 5

X²pdf (x,df)

The mean of a chi-square distribution equals the number of degrees of freedom of the ditribution

X²cdf(lower bound, upper bound, df)

find area under a chi-square distribution given the degrees of freedom P(lower bound < X² upperbound)

Z Interval (Confidence Intervals)

computes CI for unknown pop.mean with known SD

assume normal

T Interval (Confidence Intervals)

use when sample mean and SD are known

pop.mean and SD are unknown

2-SampZInt (Confidence Intervals)

Computes CI for difference between 2 pop. means

sample means and SD are known

depends on confidence interval

2-SampTInt (Confidence Intervals)

both sample means and SD are known

1-PropZInt (Confidence Intervals)

use when sample size and # of successes are known

unknown proportion for successes

2-PropZInt (Confidence Intervals)

difference between proportion of successes in 2 population

Generating Random Numbers

MATH-PRB randInt(x)