Statistics

Question 1

What is standard deviation

Answer 1

A more accurate measure of the spread of the mean. Uses all observations and less effected by outliers. Measured the spread and variability of data

Question 2

What is standard error

Answer 2

It measures the reliability of means to see if it’s representative of the whole sample

Question 3

How do you write a null hypothesis

Answer 3

There is/ is no statistically significant difference …

Question 4

What is a t-test

Answer 4

Tells you if there is a statistically significant difference between two means when a sample size is less than 25 and normally distributed.

Question 5

T-test equation

Answer 5

t = (x1-x2)
———-
(S1)2 + (s2)2 }
——- ——— } square root denominator
n1 n2 }

Question 6

What is spearman’s rank

Answer 6

Done to access the degree of association between different measurements from the same sample. Done when you have 5-30 pairs of data

Question 7

Spearman’s rank equation

Answer 7

Rs = 1 - 6€ di2
———
n3 - n

Question 8

What is Pearson’s correlation coefficient