statistical considerations Flashcards
1
Q
mean
A
average
2
Q
median
A
middle point
3
Q
standard deviation
A
measure of dispersion
4
Q
variance
A
square of standard deviation
5
Q
range
A
highest value to lowest values
6
Q
proportion
A
with certain value divided by total number…relative frequency
7
Q
calculate SD
A
- calculate mean
- subtract each value from mean
- square it
- add that
- divide by n-1 (this is variance)
- get sq root
8
Q
T-test null hypothesis
A
sample 1 = sample 2
9
Q
Alternative hypothesis for t test
A
sample 1 does not = sample 2
10
Q
P-value
A
probability of rejecting null hypothesis but it is true
11
Q
chi square test
A
X = sum (O-E)^2 / E
sum of squared differences between observed and expected counts divided by the expected counts.
12
Q
type I error
A
false positive
13
Q
type II error
A
false negative
14
Q
Alpha error
A
probability of making type I error
15
Q
Beta error
A
probability of making type II error
