Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

A Level Maths > AS Revision > Flashcards

AS Revision Flashcards

1
Q

Population

A

The whole set of items that are of interest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Sample

A

Some subset of the population intended to represent the population

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Sampling Units

A

Individual units of a population that can be sampled

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Sampling Frame

A

Sampling units of a population are individually named or numbered to form a list

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Advantages of a Census

A
  • should give a completely accurate result
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Disadvantages of a Census

A
  • time consuming and expensive
  • cannot be used when testing involves destruction
  • large volume to data to process
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Advantages of a Sample

A
  • cheaper and quicker
  • less data to process
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Disadvantages of a Sample

A
  • data may not be accurate
  • data may not be large enough to represent small sub-groups
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Random Sampling

A

Each thing in the sampling frame has an equal chance of being chosen in order to avoid bias

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Advantages of Random Sampling

A
  • bias free
  • easy and cheap to implement
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Disadvantages of Random Sampling

A
  • not suitable when population size is large
  • sampling frame needed
  • may not be representative
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Systematic Sampling

A

Required elements are chosen at regular intervals in an ordered list

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Advantages of Systematic Sampling

A
  • simple and quick to use
  • suitable for large populations
  • no bias
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Disadvantages of Systematic Sampling

A
  • sampling frame needed
  • bias can be introduced if sampling frame isn’t random
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Stratified Sampling

A

Population divided into groups (strata) and a simple random sample carried out in each group

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Advantages of Stratified Sampling

A
  • reflects population structure
  • guarantess proportional representation within population
17
Q

Disadvantages of Stratified Sampling

A
  • population must be clearly classified into distinct strata
  • same disadvantages as simple random sampling
18
Q

Quota Sampling

A

Use stratified sampling to divide population into strata
Actively choose people within each strata until the quota of each group is filled

19
Q

Advantages of Quota Sampling

A
  • no sampling frame needed
  • quick, easy, inexpensive
20
Q

Disadvantages of Quota Sampling

A
  • can introduce bias
  • population must be grouped into clear strata
21
Q

Opportunity Sampling

A

Find people at the same time the survey is being carried out

22
Q

Advantages of Opportunity Sampling

A
  • easy to carry out
  • inexpensive
23
Q

Disadvantages of Opportunity Sampling

A
  • unlikely to provide a representative sample
  • highly dependent on individual researcher
24
Q

Coding: Effect on Mean

A

Add/Sub = same effect
Div/Mul = same effect

25
Q

Coding: Effect on Standard Deviation

A

Add/Sub = no effect
Div/Mul = same effect

26
Q

Cleaning Data

A

Removing Anomalies

27
Q

Frequency Density =

A

Frequency/Class Width

28
Q

Casual Relationship

A

Two variables have a casual relationship if a change in one variable causes a change in the other

29
Q

Least Squares Regression Line

A

Best line of best fit
y = a + bx
+ve b = +ve correlation

30
Q

Probability

A

Mutually Exclusive Events: P(A and B) = 0
Independent Events: P(A and B) = P(A) x P(B)

31
Q

Binomial Distribution

A
  • fixed number of trials
  • two possible outcomes
  • fixed probability of success
  • trials are independent
32
Q

Hypothesis Test

A
  • Let X be …
  • H0: p=x H1:p>x p = probability of …
  • Significance Level = 5% = 0.05
  • X - B(n,x) P(X>/ z) = 1 - P(X< z-1)
  • Compare Values
  • There is/is not enough evience to reject the H0
  • Make the statement in context
33
Q

Two-Tailed Tests

A

Half the significance level

34
Q

Derive SUVAT

A

Velocity Time Graphs
- gradient -> v = u+at
- area underneath -> s=1/2(u+v)t
- sub variables from v = u+at into s=1/2(u+v)t

A Level Maths (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions