test significance

Question 1

what is a null hypothesis ?

Answer 1

A null hypothesis (H0) states that two treatments are equally effective

there is no significant difference between specified population

Question 2

hat is alternative hypothesis ?

Answer 2

There is a difference between the two treatments

Question 3

what is fisher’s exact test giving a P

Answer 3

A statistical test used to determine if there are nonrandom associations between two categorical variables

e is the probability of obtaining a result by chance at least as extreme as the one that was actually observed, assuming that the null hypothesis is true.

Question 4

what are the two types of error when testing null hypothesis ?

Answer 4

type I: the null hypothesis is rejected when it is true -

type II: the null hypothesis is accepted when it is false - i.e. Failing to spot a difference when one really exists, a false negative. The probability of making a type II error is termed beta. It is determined by both sample size and alpha