critical numbers 4: hypothesis testing

Question 1

inferential statistics vs summary statistics

Answer 1

We use information from a sample to make inference and draw conclusion about the population

We use summary statistics to describe our sample

Question 2

hypothesis testing

Answer 2

assume no difference, null hypothesis- H0

H1/a- alternative hypothesis, theres is a difference, two tailed

0- impossible
1- certain

is there a statistically significat difference, set at 0.05 (probability we make a false positive conclusion ad reject the null hypothesis when it’s true)

calculate the test statsitic agaisnt the distribution we wpould expect under null hypothesis

use p value from t-test

The p-value is the probability of seeing an effect of the observed magnitude or greater if the null hypothesis were true

p is high- probale
p is low- not probable