Edexcel AS Level Maths Statistics
EXAM STUDY GUIDE 2026/2027
COMPLETE QUESTIONS WITH
VERIFIED CORRECT ANSWERS ||
100% GUARANTEED PASS
<NEWEST VERSION>
1. Population - ANSWER ✔ The whole set of items that are of interest
2. Census - ANSWER ✔ Observes or measures every member of a population
3. Advantages of a census - ANSWER ✔ It should give a completely accurate
result
4. Disadvantage of a census - ANSWER ✔ Time consuming and expensive
Hard to process large quantity of data
5. Linear Regression - ANSWER ✔ y = axⁿ
logy = loga + nlogx
6. Exponential Regression - ANSWER ✔ y = ab^x
, logy = loga + xlogb
7. Normal Approximation - ANSWER ✔ µ = np
σ =√(np(1-p))
8. Mean - ANSWER ✔ ∑x ÷ n
GF: ∑xf ÷ ∑f
9. Variance - ANSWER ✔ (∑x²/n) - (∑x/n)²
10.Standard Deviation - ANSWER ✔ √variance
11.Histograms: Height - ANSWER ✔ Area = k x frequency
12.Frequency Density - ANSWER ✔ frequency ÷ class width
13.Population - ANSWER ✔ Whole set of items of interest.
14.Census - ANSWER ✔ Observes/measures every member of a population
15.Sample - ANSWER ✔ Selection of observations taken from a subset of the
population which is used to find out info about the population.
,16.Sampling Frame - ANSWER ✔ A list of individuals (named or numbered)
from whom the sample is drawn
17.Random Sampling - ANSWER ✔ Every member of the population has an
equal chance of being selected
18.Systematic Sampling - ANSWER ✔ Every nth person is chosen.
19.Stratified Sampling - ANSWER ✔ Population is divided into mutually
exclusive Strat and a random sample is taken from each.
20.Quota Sampling - ANSWER ✔ Interviewer selects a sample that reflects the
characteristics of the population
21.Opportunity Sampling - ANSWER ✔ Choosing whoever is available
22.What is a quantitative variable? - ANSWER ✔ A variable associated with
numerical observations.
23.What is a qualitative variable? - ANSWER ✔ A variable associated with
non-numerical observations.
24.What is continuous data? - ANSWER ✔ Data that can take any value on a
given range. e.g. height, weight, length etc.
, 25.What is discrete data? - ANSWER ✔ Data that can only take specific values.
e.g. shoe size, number of people, colour.
26.What is the formula for Mean from a Frequency Table? - ANSWER ✔
27.What are the steps in calculating the Mean from a Frequency Table? -
ANSWER ✔ 1) Add a column for midpoints, x.
2) Multiply the frequencies by midpoints and add to the fx column.
3) Add up the fx column.
4) Divide the sum of the fx column by the total frequency.
28.How is the Interquartile Range calculated? - ANSWER ✔ Upper Quartile -
Lower Quartile
29.What is the formula for Standard Deviation for a list of numbers? -
ANSWER ✔
30.What are the steps in calculating the Standard Deviation for a list of
numbers? - ANSWER ✔ 1. Add up all the values of x, this is ∑x
2. Square all the values and add up, this is ∑x²
3. Count the number of values, this is n.
4. Substitute all these values into the formula.
31.What is the formula for Standard Deviation for a Frequency Table? -
ANSWER ✔
32.What are the steps in calculating the Standard Deviation from a Frequency
Table? - ANSWER ✔ 1. Calculate the mean.
EXAM STUDY GUIDE 2026/2027
COMPLETE QUESTIONS WITH
VERIFIED CORRECT ANSWERS ||
100% GUARANTEED PASS
<NEWEST VERSION>
1. Population - ANSWER ✔ The whole set of items that are of interest
2. Census - ANSWER ✔ Observes or measures every member of a population
3. Advantages of a census - ANSWER ✔ It should give a completely accurate
result
4. Disadvantage of a census - ANSWER ✔ Time consuming and expensive
Hard to process large quantity of data
5. Linear Regression - ANSWER ✔ y = axⁿ
logy = loga + nlogx
6. Exponential Regression - ANSWER ✔ y = ab^x
, logy = loga + xlogb
7. Normal Approximation - ANSWER ✔ µ = np
σ =√(np(1-p))
8. Mean - ANSWER ✔ ∑x ÷ n
GF: ∑xf ÷ ∑f
9. Variance - ANSWER ✔ (∑x²/n) - (∑x/n)²
10.Standard Deviation - ANSWER ✔ √variance
11.Histograms: Height - ANSWER ✔ Area = k x frequency
12.Frequency Density - ANSWER ✔ frequency ÷ class width
13.Population - ANSWER ✔ Whole set of items of interest.
14.Census - ANSWER ✔ Observes/measures every member of a population
15.Sample - ANSWER ✔ Selection of observations taken from a subset of the
population which is used to find out info about the population.
,16.Sampling Frame - ANSWER ✔ A list of individuals (named or numbered)
from whom the sample is drawn
17.Random Sampling - ANSWER ✔ Every member of the population has an
equal chance of being selected
18.Systematic Sampling - ANSWER ✔ Every nth person is chosen.
19.Stratified Sampling - ANSWER ✔ Population is divided into mutually
exclusive Strat and a random sample is taken from each.
20.Quota Sampling - ANSWER ✔ Interviewer selects a sample that reflects the
characteristics of the population
21.Opportunity Sampling - ANSWER ✔ Choosing whoever is available
22.What is a quantitative variable? - ANSWER ✔ A variable associated with
numerical observations.
23.What is a qualitative variable? - ANSWER ✔ A variable associated with
non-numerical observations.
24.What is continuous data? - ANSWER ✔ Data that can take any value on a
given range. e.g. height, weight, length etc.
, 25.What is discrete data? - ANSWER ✔ Data that can only take specific values.
e.g. shoe size, number of people, colour.
26.What is the formula for Mean from a Frequency Table? - ANSWER ✔
27.What are the steps in calculating the Mean from a Frequency Table? -
ANSWER ✔ 1) Add a column for midpoints, x.
2) Multiply the frequencies by midpoints and add to the fx column.
3) Add up the fx column.
4) Divide the sum of the fx column by the total frequency.
28.How is the Interquartile Range calculated? - ANSWER ✔ Upper Quartile -
Lower Quartile
29.What is the formula for Standard Deviation for a list of numbers? -
ANSWER ✔
30.What are the steps in calculating the Standard Deviation for a list of
numbers? - ANSWER ✔ 1. Add up all the values of x, this is ∑x
2. Square all the values and add up, this is ∑x²
3. Count the number of values, this is n.
4. Substitute all these values into the formula.
31.What is the formula for Standard Deviation for a Frequency Table? -
ANSWER ✔
32.What are the steps in calculating the Standard Deviation from a Frequency
Table? - ANSWER ✔ 1. Calculate the mean.
