Hypothesis Testing

Question 1

null vs alternative hypothesis

Answer 1

null (Ho): NOT different

alt (Ha): different

Question 2

basic 4 steps of hypothesis testing

Answer 2

state null and alternative hypothesis
establish critical values
calculate t or Z score from sample
compare calculated t or Z with critical values to accept or reject null

Question 3

type 1/alpha error

Answer 3

reject null hypothesis when it is actually true

Question 4

type 2/beta error

Answer 4

accept null hypothesis when it is actually false

Question 5

degrees of freedom

Answer 5

N - 1

Question 6

how to calculate t-score

Answer 6

t = Xbar - u / s / root(N)

Question 7

what is p value

Answer 7

probability value, determines whether to accept or reject Ho

if p 0.05 fail to reject Ho

Question 8

two-tailed t-test

Answer 8

do not presume at which extreme of the normal distribution the difference lies, so test both sides

Question 9

4 ways to increase power of a statistical test

Answer 9

increase critical region
increase size of difference between sample and hypothesized means
decrease sampling error
increase sample size