Stats Year 1 C2 Flashcards
1
Q
mean =
A
X bar
sum of x / n
2
Q
To find Lower quartile
A
divide n by 4
if a whole number, quartile is galway between this point and one above
if not a whole number round up
3
Q
to find upper quartile
A
¾ of n
if whole, = halfway
if not whole round up
4
Q
IQR =
A
Q3 - Q1
5
Q
Interpercentile range
A
difference between values for 2 percentiles
6
Q
Variance
A
sxx/ n
Σx² - (Σx²) / n
7
Q
standard deviation
A
√mean of the squares - square of the mean
