Chi-squared

Question 1

tests for

Answer 1

differences in categories

Question 2

null hypothesis

Answer 2

there is no bed load size difference at site 1 and site 8

Question 3

alternative hypothesist

Answer 3

there is a difference in bed load size at site 1 and site 8

Question 4

method

Answer 4

• generate null and alternative hypothesis
• calculate the even or equal distribution using formula
• compare data and observe if it looks significantly different or random than expected
• take the expected value from the observed and use formula
• the higher the value of chi squared, the greater the difference

Question 5

required sample size

Answer 5

must be grouped into categories

Question 6

advantages

Answer 6

deals with data in frequencies

has precise numerical values

Question 7

disadvantages

Answer 7

• lengthy calculation

- prone to human error from data collection

Question 8

findings from sabden

Answer 8

99.9% sure bedload decreased for a reason and not by chance