Statistics

Question 1

Chi squared

Answer 1

• when comparing frequencies of things in different categories
• to see if results are the same in multiple categories, same as expected or see if 2 factors are affected
• if calculated value is bigger than critical value REJECT null hypothesis
• null hypothesis is always “no significant difference between observed and expected results”
• n - 1

Question 2

Spearman’s Rank Correlation Test

Answer 2

• when investigating relationship (correlation) between 2 variables
• null hypothesis is always “no significant correlation/relationship between two variables
• if calculated value is bigger than critical value REJECT null hypothesis

Question 3

Mann-Whitney U

Answer 3

• investigating whether there is a significant difference between two averages
• use if data is counted not measured
• null hypothesis is always “there is no significant difference between A and B”
• data is not normally distributed
• if calculated value is bigger than critical value ACCEPT null hypothesis

Question 4

T-Test

Answer 4

• investigate whether there is a significant difference between two averages
• use if data is measured not counted
• null hypothesis is always “there is no significant difference between A and B”
• Data is normally distributed
• If calculated value is bigger than critical value REJECT null hypothesis
• n - 2