Module 5

Question 1

what does a statistically significant result mean?

Answer 1

that the sample mean is different from the population mean

this is based on probability - you can’t see reality

Question 2

type I error

Answer 2

false positive

rejecting the null when the null is in fact true

probability of alpha, which is typically .05

this happends too frequently in science

Question 3

type II error

Answer 3

failing to reject the null hypothesis when the null is actually false

false negative

Question 4

power

Answer 4

the probability that a test is going to find a legitimate result

we usually set this at 80%

Question 5

statistical power

1 - B

Answer 5

the probability of rejecting the null when you should

it’s when you find a difference between means and one actually exists in reality

things that effect power:
1. sample size - the greater the sample size, the greater the power
2. directional/
3. higher alpha is higher power (.01 is greater than .05)
4. intensity of experimental manipulation