Statistics 1

Question 1

What is a population

Answer 1

The whole set that are of intrest

Question 2

What is a sample

Answer 2

some subset of the population intended to represent the population

Question 3

What is a sampliling frame?

Answer 3

Sampiling untis are individually named and numbered

Question 4

What is a sampiling unit?

Answer 4

Each individual thing

Question 5

What are the advantages of a cencus?

Answer 5

• Should give compleatly accurate results

Question 6

What are the dissadvantages of a census?

Answer 6

• Time consumng
• Expensive
• Cannot use is testing is destructive
• large volume of data to procces

Question 7

What are the advantages of a sample?

Answer 7

• cheaper
• quicker
• less data to procces

Question 8

What are the dissadvantages of using a sample?

Answer 8

• Data may not be accurate

- Data may not be large enough to represent small sub-groups

Question 9

How is simple random sampling carried out?

Answer 9

Each item is given an identity number, then a random number generator is used.

Question 10

Adv of simple random sampling

Answer 10

• bias free
• easy and cheap
• each number has equal chance of being picked

Question 11

Disadvantages of simple random sampling.

Answer 11

• not suitable when population size is large

- smapiling frame is needed.

Question 12

How do you carry out Systematic sampling?

Answer 12

Elements are chosen at regualr intervals in an ordered list
take every K^th number
k = poulation size/ sample size

Question 13

What are the advantages of Systematic sampling?

Answer 13

• simple & quick to use

- suitable for large samples/poulations

Question 14

Dissadvantages of using Systematic sampling?

Answer 14

• sample frames needed

- can introduce bias if sampling frame is not random

Question 15

How do you carry out Stratified sampling?

Answer 15

The population is divided into groups (stratas) and a simple random sample is carried out in each group.
Sample size/population size this proportion is used

Question 16

How do you carry out quota sampling? Advantages/ dis

Answer 16

Like stratified but strata filled by a reasearcher
-No sampling frame needed
-non-random, potetial bias

Question 17

How do you carry out sampling

Answer 17

Quota filled by thoses availale at the time
-easy cheep
-unlikely to be representative

Question 18

What does qualatiative data mean

Answer 18

None numberical, like a colour.

Question 19

What does quantative data mean?

Answer 19

Numerical, either dicrete or continuous

Question 20

What are the international stations?

Answer 20

Cambourn
hurn
heathrow
leeming
leuchurs

Question 21

When was the data set recorded?

Answer 21

May-October 1987- 2015
only six months

Question 22

What are the international stations

Answer 22

Preth
Beijing, china very sunny and raining in summer, very cold winter
Jacksonville , sunny hurricanes oct 85 oct15

Question 23

What is 1 Knot equal to? when big storm?

Answer 23

1.15mph great story 0ct15/16 87

Question 24

What is the advantage of IQR?

Answer 24

It ignores extreams

Question 25

How do you find varience?

Answer 25

Question 26

What do you talk about when comparing two graphs?

Answer 26

1) Location
2) Spread (use context)

Question 27

What is interpolation?

Answer 27

Estimating inside the data range
- usually more reliable.

Question 28

What is extrapolation?

Answer 28

Estimating outside of the data range
- Not reliable

Question 29

What is the probability of A Given B?

Answer 29

P (A)

Question 30

What are the tests of independence?

Answer 30

Question 31

Answer 31

Question 32

What is Discrete Uniform Distribution?

Answer 32

Probabilitys of all outcomes are all equal

Question 33

When do you use binomial Distribution?

Answer 33

Question 34

Normal distributions
-Point of inflection
-percentages of data in 1 2 and 3 standard deviations of data

Answer 34

Question 35

what data analasis is not effected by outliers?

Answer 35

median and IQR