Measures of Location and Spread, Data Representations and Probability Flashcards
How do you calculate the mean from data in a frequency table?
sum of products of the data values and their frequencies / sum of frequency
How do you calculate the lower quartile?
n/4
How do you find the upper quartile?
3n/4
How do you calculate IQR?
Q3-Q1
How do you calculate variance?
x^2/ -(x/n)^2
n
How do you calculate standard deviation?
square root of variance
If data is coded as (x-a)/b, what is mean?
(mean x -a)/b
How do you calculate outliers?
bigger than Q3 + k(Q3-Q1)
less than Q1 - k(Q3-Q1)
What is cleaning?
removing anomalies from data
how do you calculate frequency density?
frequency / class width
how do you calculate area of the bar?
k * frequency
what is correlation?
the relationship between 2 linear variables
what is the regression line?
line of best fit, y = a + bx
intersection
A and B
AnB
union
A or B
AuB
complement
Not A/B
A’
How do you know if an event is mutually exlusive?
p(AuB) = p(a) + p(b)
what is mutually exlusive?
events that have no outcomes in common
what is independent?
one event has no effect on the other
how do you know if something is independent?
P(a and B) = p(a) x p(b)
