Edexcel AS Level Maths Statistics
Advantages of a census - ANS It should give a completely accurate result
\Advantages of a sample - ANS Less time consuming
Fewer people have to respond
Less data than a census
\Advantages of Opportunity Sampling - ANS Easy to carry out
Inexpensive
\Advantages of Quota Sampling - ANS Allows a small sample to still represent the whole
population
No sampling frame required
Quick, easy and inexpensive
Allows for easy comparison between different groups in the population
\Advantages of Simple Random Sample - ANS Free of bias
Easy and cheap to implement
Each sampling unit has equal chance of selection
\Advantages of Stratified Sampling - ANS Population must clearly classified into distinct
strata
\Advantages of Systematic Sampling - ANS Simple and quick to use
Suitable for large samples
\alternative hypothesis - ANS Tells us about the parameter if your assumption is wrong
\binomial distribution - ANS When there are a fixed number of trials
There are 2 possible outcomes (success or failure)
There is a fixed probability of success
The trials are independent of each other
\bivariate data - ANS Data which has pairs of values for two variables
\Census - ANS Observes or measures every member of a population
\Class Boundaries - ANS The maximum and minimum values that belong in each class
\Class Width - ANS The difference between the upper and lower class boundaries
\Cleaning the data - ANS The process of removing anomalies from a data set.
\Continuous Variable - ANS A variable that can take any value in a given range
\Correlation - ANS A measure of the linear relationship between two variables
\critical region - ANS the area in the tails of the comparison distribution in which the null
hypothesis can be rejected
\Disadvantage of a census - ANS Time consuming and expensive
Hard to process large quantity of data
\Disadvantage of a sample - ANS The data may not be as accurate
The data may not be large enough toggle information about the population
\Disadvantage of Simple Random Sample - ANS A sampling frame is needed
Not suitable when the population size is very big
\Disadvantages of Opportunity Sampling - ANS Unlikely to provide a representative
sample
Advantages of a census - ANS It should give a completely accurate result
\Advantages of a sample - ANS Less time consuming
Fewer people have to respond
Less data than a census
\Advantages of Opportunity Sampling - ANS Easy to carry out
Inexpensive
\Advantages of Quota Sampling - ANS Allows a small sample to still represent the whole
population
No sampling frame required
Quick, easy and inexpensive
Allows for easy comparison between different groups in the population
\Advantages of Simple Random Sample - ANS Free of bias
Easy and cheap to implement
Each sampling unit has equal chance of selection
\Advantages of Stratified Sampling - ANS Population must clearly classified into distinct
strata
\Advantages of Systematic Sampling - ANS Simple and quick to use
Suitable for large samples
\alternative hypothesis - ANS Tells us about the parameter if your assumption is wrong
\binomial distribution - ANS When there are a fixed number of trials
There are 2 possible outcomes (success or failure)
There is a fixed probability of success
The trials are independent of each other
\bivariate data - ANS Data which has pairs of values for two variables
\Census - ANS Observes or measures every member of a population
\Class Boundaries - ANS The maximum and minimum values that belong in each class
\Class Width - ANS The difference between the upper and lower class boundaries
\Cleaning the data - ANS The process of removing anomalies from a data set.
\Continuous Variable - ANS A variable that can take any value in a given range
\Correlation - ANS A measure of the linear relationship between two variables
\critical region - ANS the area in the tails of the comparison distribution in which the null
hypothesis can be rejected
\Disadvantage of a census - ANS Time consuming and expensive
Hard to process large quantity of data
\Disadvantage of a sample - ANS The data may not be as accurate
The data may not be large enough toggle information about the population
\Disadvantage of Simple Random Sample - ANS A sampling frame is needed
Not suitable when the population size is very big
\Disadvantages of Opportunity Sampling - ANS Unlikely to provide a representative
sample
