Statistics: Chapter 2 - Measures Of Location & Spread Flashcards
1
Q
What is the mean (x̄)?
A
(Σx) / n
2
Q
What is the mean (frequency table)?
A
(Σxf) / Σf
3
Q
What is the median?
A
(n + 1) / 2
4
Q
What is the lower quartile?
A
25% of n (if not a whole number, round up).
5
Q
What is the upper quartile?
A
75% of n (if not a whole number, round up).
6
Q
What is linear interpolation?
A
LB + (Value / Frequency) X CW
7
Q
What is the interquartile range?
A
Q3 - Q1
8
Q
What is
-variance?
-standard deviation?
A
- (∑x^2 / n) - (x̄^2)
- √ [(∑x^2 / n) - (x̄^2)]
9
Q
What is the formulae that data is normally coded in?
A
y = (x - a) / b
10
Q
What is the mean of the coded data?
A
ȳ = (x̄ - a) / b
11
Q
What is the equation to calculate the coded mean?
A
(x̄ - a) / b
12
Q
What is the equation to calculate the coded standard deviation?
A
x̄ / b
