Stats Tests

Question 1

Standard deviation

Answer 1

A measure of how spread out the data is. The greater the spread the greater the standard deviation.

Question 2

Student T-tests

Answer 2

Used to find out if there is a significant difference between two sets of data

Question 3

Degrees of freedom equation

Answer 3

(n1-1)+(n2-2)

Use this a to find the p value for all T-tests

Question 4

Unpaired T tests

Answer 4

Compares results from different individuals (e.g. two crops from different fields)

Question 5

Spearman’s Rank Correlation coefficient

Answer 5

Used to assess the strength of a correlation between two continuous or ordinal variables that can be ranked

Question 6

Null hypothesis

Answer 6

There is no significant correlation/difference between…

Question 7

Alternate hypothesis

Answer 7

There is a significant difference/correlation between…

Question 8

Simpson’s index of biodiversity

Answer 8

A better measure of biodiversity as it takes into account t species richness and species evenness

Always results in an answer of 0 to 1, with 0 being no diversity and 1 being infinite diversity

The greater the value the greater the diversity