Quan - T-test and Mann - Whitney U

Question 1

T-test and Mann - Whitney U what variables?

Answer 1

Categorical - nominal and ordinal
viruses
a Numeric variable or a interval variable

Question 2

Use histogram before both T-test and Mann - Whitney U -

Normally distributed use-

Answer 2

T-test

Question 3

Use histogram before both T-test and Mann - Whitney U -

NOT Normally distributed use-

Answer 3

Mann- Whitney U - the non-parametric alternative test

Question 4

Non-parametric tests =

Answer 4

when data is not normally distributed

Question 5

Mann whitney U =

Answer 5

used to test for differences between two independent groups on a continuous measure

• compares the MEDIAN
• converts into ranks to evaluate whether ranks differ significantly
• as converted to ranks actual distribution doesn’t matter

Question 6

T-test =

Answer 6

comparing the MEANS of two groups

looks at standard deviation between the means

Question 7

U value =

Answer 7

the mann-whitney u statistic