Statistical Tests

Question 1

Process of finding standard deviation

Answer 1

-calculate mean
-subtract mean from each measured value
-square each of these values
-add these together
-divide this by sample size minus 1
-find square root of value, SD is plus or minus around mean

Question 2

What does x with line above mean

Answer 2

Mean

Question 3

What is the students t-test used to measure

Answer 3

To test if there is significant dif between two sets of data

Question 4

When is unpaired t test used

Answer 4

If different organisms

Question 5

How to calculate degrees of freedom

Answer 5

(n1 + n2) -2

Question 6

What probability to use

Answer 6

P= 0.05, 95% probability results not due to chance but due to change in DV

Question 7

Why is spearman’s rank used

Answer 7

To see if a significant relationship in correlation, if positive/negative correlation, if strong/weak and if relationship signif

Question 8

What is degrees of freedom in spearman’s rank

Answer 8

Number of individuals

Question 9

How to calculate spearman’s rank

Answer 9

-find ranks of dif values and calculate difference, square difference and add all together, multiply by 6 and divide by n(n2 -1) and take away from 1