Statistcs

Question 1

What is standard deviation and equation

Answer 1

standard deviation measures the spread from the middle

S= square root of the sum of (value - mean)2 / number of values - 1

Question 2

What is null hypothesis

Answer 2

There will be no significant difference between things you are measuring or there will be no correlation if your hypothesis is that 2 variables are correlated

Question 3

Define and give formula for the chi squared test

Answer 3

Looks at differences in frequencies between groups
X2= sum of (observed frequency - Expected frequency)2/ expected frequency
Expected frequency = raw total x column total / overall total

Question 4

Define t test

Answer 4

Tells you if the difference between the mean is significant