Research methods

Question 1

What is spearsmans rank - give me an advantage and disadvantage

Answer 1

tests the strength and direction (positive or negative) of the correlation.

pos - useful when a scatter diagram is ambiguous

neg - Only indicates whether two variables have a correlation, and not why

Question 2

What is man-whitney u - give me advantage and disadvantage

Answer 2

compares 2 groups when the data is non-parametric (abnormally distributed)

tells us if the data is significant

can only tests 2 data sets

Question 3

What is chi square test and give me advant and dis

Answer 3

to determine if a difference between observed data and expected data is due to chance, or if it is due to a relationship between the variables you are studying

tells us association between variables

sensitive to sample size

Question 4

What is t-test, give me advant and dis

Answer 4

T-tests are used to compare two means of continuous data (Parametric data)

can be used with large samples

cant be used with more than 2 groups

Question 5

what is ANOVA, give me advant and dis

Answer 5

is used to compare the means of three or more groups.

can be used to compare more groups

ANOVA requires a large sample size to produce accurate results.

Question 6

What is a type I error in statistical tests?

What is a type II error in statistical tests?

Answer 6

What is a type I error in statistical tests?
A type I error occurs when we reject a null hypothesis that is actually true. It is also known as a false positive.

What is a type II error in statistical tests?
A type II error occurs when we fail to reject a null hypothesis that is actually false. It is also known as a false negative.

Question 8

Difference between parametric and non parametric data

Answer 8

Parametric is normally distributed data
Non parametric is skewed data (nominal or ordinal data)