Statistics

Question 1

data analysis

Answer 1

relies on data collection

Question 2

experimental design

Answer 2

helps design experiments, determines sample size, increases accuracy

Question 3

hypothesis statement

Answer 3

provides ways to test hypothesis as to whether occur by chance

Question 4

predictive modelling

Answer 4

used to predict

Question 5

risk assessment

Answer 5

helps assess hazards

Question 6

decision making

Answer 6

helps make decisions

Question 7

consider 4 things when describing/summarising data

Answer 7

centrality, dispersion, replication, shape

Question 8

centrality

Answer 8

average

Question 9

dispersion

Answer 9

how spread out values are from average

Question 10

replication

Answer 10

how many samples

Question 11

shape

Answer 11

how evenly spread data is

Question 12

measure of centrality/central tendency

Answer 12

compares differences between datasets

Question 13

mean equation

Answer 13

x(-)= 3x/n

Question 14

median equation

Answer 14

1/2(n+1)

Question 15

n

Answer 15

how many samples there are (not sum)

Question 16

x

Answer 16

value of all data

Question 17

measure of dispersion

Answer 17

standard deviation (s), variance (s(2))

Question 18

standard deviation

Answer 18

\/3(x-x(-))(2)/n-1

Question 19

variance

Answer 19

3(x-x(-))(2)/n, then square root

Question 20

what does interquartile range measure

Answer 20

data thats not normally distributed

Question 21

minimum, lower quartile, median, upper, maximum

Answer 21

0%, 25% 1st quartile, 50% 2nd quartile etc

Question 22

work out interquartile range

Answer 22

q3-q1

Question 23

confidence interval

Answer 23

probability something will fall between values around mean

Question 24

mean absolute deviation

Answer 24

measures how much values vary from mean

Question 25

qualitive data

Answer 25

ordinal, nominal

Question 26

quantitative data

Answer 26

discrete, continuous

Question 27

datum/cases

Answer 27

single value

Question 28

what makes histogram

Answer 28

group frequency table

Question 29

histogram

Answer 29

measures spread/location

Question 30

measure of spread

Answer 30

range/quartiles/standard deviation/variance

Question 31

measure of location

Answer 31

mean/median/mode

Question 32

right/left skewed

Answer 32

mean to right/left

Question 33

function

Answer 33

describes relationship between input/output

Question 34

input, output

Answer 34

(x), f(x)

Question 35

random variable

Answer 35

from random events, discrete/continuous, calculated by functions

Question 36

probability distribution

Answer 36

discrete, lists all random variable values and probability

Question 37

probability mass function

Answer 37

discrete, values between 0-1, sum of outcomes equal 1

Question 38

probability density function

Answer 38

continuous,, outputs are greater or equal 0, probability estimated under curve

Question 39

area under curve sums to

Answer 39

1