A level

Question 1

What does the PMCC measure?

Answer 1

The linear association between two variables

Question 2

What is the explanatory variable?

Answer 2

Like an independent variable - however, it may be influenced by some other variable ( usually the horizontal variable)

Question 3

What is data

Answer 3

Information collected from various sources

Question 4

d qualitative data

Answer 4

descriptive data, categories

Question 5

d Quantitative

Answer 5

Numerical data

Question 6

What are the two types of quantitative data?

Answer 6

Discrete and continuous

Question 7

What are the median mode and mean examples of

Answer 7

measures of central tendency

Question 8

What are the range and interquartile range?

Answer 8

Measures of spread

Question 9

Define variance

Answer 9

Mean sum of the squares

Question 10

d standard deviation

Answer 10

root of variance

Question 11

D deviation

Answer 11

difference between the data and the mean

Question 12

What is data cleaning

Answer 12

dealing with missing/ anomolous data

Question 13

What are outliers

Answer 13

1.5x IQR

3 x standard deviation

Question 14

d interpolation

Answer 14

guessing within the data set

Question 15

d extrapolation

Answer 15

outisde the data set

Question 16

d population

Answer 16

Every item with the group (finite of infinte)

Question 17

d Census

Answer 17

every memeber of the popualtion is sampled

Question 18

d sample survey

Answer 18

informatino being collected from a small representitive part of the population

Question 19

d sampling unit

Answer 19

individual member of the smapled population

Question 20

d sampling frame

Answer 20

collection of all the units (have to have unique names or codes)

Question 21

d Target popualtion

Answer 21

group from which your sample has been taken from -sample should represent this

Question 22

d Bias

Answer 22

Sample does not refelct target population

Question 23

d random sampling, +-

Answer 23

everyone in the the population has equal chance
+ bias eliminated
- difficult

Question 24

d stratified sampling

Answer 24

strata (groups in sample) are proportionately represented

Question 25

d Quota sampling +-

Answer 25

Splitting the population into a group and sampling a chosen number of people from each group +easy - often leads to poor representations

Question 26

d systematic sampling +-

Answer 26

Choosing every nth unit in a list +fair difficult

Question 27

d opportunity sampling +-

Answer 27

survey whatever you can +easy - likely biased

Question 28

What is special about a histogram

Answer 28

Area represents frequency

Question 29

d p-value

Answer 29

the calculated probability that the test is true given the null hypothesis

Question 30

When approximating a binomial what do you have to remember

Answer 30

continuity correction

Question 31

What is a hypothesis test

Answer 31

statistical test | to test if evidence in the sample can infer whether a condition is true for the entire population

Question 32

What do you do in a two tail test

Answer 32

half the significance level

Question 33

What are the requirements for approximating the binomial?

Answer 33

p ~ 0.5 | n is large

Question 34

Define mutually exlcusive

Answer 34

cannot happen at the same time | P(A∩B) = 0

Question 35

∩

Answer 35

intersection

Question 36

∪

Answer 36

Union

Question 37

Define independent

Answer 37

do not affect each other | P(A∩B) = P(A)xP(B)

Question 38

Equation for conditional probability

Answer 38

P(A/B) = P(A∩B)/P(B)

Question 39

LDS UK destinations from North to South

Answer 39

``` Leuchars Leeming Heathrow Hurn Cambourne ```

Question 40

LDS overseas destinations North to south

Answer 40

Beijing Jacksonville Perth

Question 41

What data is discrete in LDS

Answer 41

Cloud cover (oktas)

Question 42

What is mist and fog LDS

Answer 42

above 95%

Question 43

What is a knot in mph

Answer 43

1 knot = 1.15 mph

Question 44

Why is data cleaning important LDS

Answer 44

often contains n/a values or trace or mistypes

Question 45

what is a trace LDS

Answer 45

rain less than 0.05mm

Question 46

What is the only location below the equator LDS

Answer 46

Perth

Question 47

When was the LDS data collected

Answer 47

1 May to Oct 31 | 1987 and 2015

Question 48

LDS when was 1987 big storm

Answer 48

15/16 oct

Question 49

d test statistic

Answer 49

A statistic that is calculated from sample data in order to test a hypothesis about a population.

Question 50

critical value

Answer 50

A critical value is the point (or points) on the scale of the test statistic beyond which we reject the null hypothesis.