PSAT FINAL

p

parameter (whole thing)

p̂

for statistic (not the whole thing)

a

significance level

if p value is greater than a then we

fail to reject the null

SCOS

shape- mode/symmetry/Unimodal and symmetric

outliers

center- symmetric use mean. skewed use median

spread- symmetric = standard deviation. skewed = IQR

n

sample size

σ²

variance parameter notion

σ

standard deviation parameter notation

s

standard deviation statistic notion

if p value is less then a then we..

reject the null

x̄

mean statistic notation

s²

variance statistic notation

μ

mean parameter notation

r

correlation coefficient

Bo

estimated y intercept

B1

estimated slope

e

residual (sample level)

∈

residual (population level)

(little) y

observed test score (from the data)

positive

negative

when analyzing a point plot graph you need to state…

direction (negative positive), strength (strong moderate), outliers, form(linear)

definition of confidence interval

range of values so defined that there is a specified probability that the value of a parameter lies within it (point estimate)