Measures of Location and Spread, Data Representations and Probability

Question 1

How do you calculate the mean from data in a frequency table?

Answer 1

sum of products of the data values and their frequencies / sum of frequency

Question 2

How do you calculate the lower quartile?

Answer 2

n/4

Question 3

How do you find the upper quartile?

Answer 3

3n/4

Question 4

How do you calculate IQR?

Answer 4

Q3-Q1

Question 5

How do you calculate variance?

Answer 5

x^2/ -(x/n)^2
n

Question 6

How do you calculate standard deviation?

Answer 6

square root of variance

Question 7

If data is coded as (x-a)/b, what is mean?

Answer 7

(mean x -a)/b

Question 8

How do you calculate outliers?

Answer 8

bigger than Q3 + k(Q3-Q1)
less than Q1 - k(Q3-Q1)

Question 9

What is cleaning?

Answer 9

removing anomalies from data

Question 10

how do you calculate frequency density?

Answer 10

frequency / class width

Question 11

how do you calculate area of the bar?

Answer 11

k * frequency

Question 12

what is correlation?

Answer 12

the relationship between 2 linear variables

Question 13

what is the regression line?

Answer 13

line of best fit, y = a + bx

Question 14

intersection

Answer 14

A and B
AnB

Question 15

union

Answer 15

A or B
AuB

Question 16

complement

Answer 16

Not A/B
A’

Question 17

How do you know if an event is mutually exlusive?

Answer 17

p(AuB) = p(a) + p(b)

Question 18

what is mutually exlusive?

Answer 18

events that have no outcomes in common

Question 19

what is independent?

Answer 19

one event has no effect on the other

Question 20

how do you know if something is independent?

Answer 20

P(a and B) = p(a) x p(b)