7 
 Use a twoway table, tree diagram or Venn diagram to calculate conditional probability
 Decide if two events are independent
 Construct and interpret histograms
 Estimate the mean from a histogram
 Compare median and interquartile range of two distributions
 From a cumulative frequency graph estimate frequency greater/less than a given value
 Work out the size of each group in a stratified sample

6 
 Construct and interpret cumulative frequency graphs
 Find the median, quartiles and interquartile range for large data sets with grouped data
 Compare the measures of spread between a pair of box plots/cumulative frequency graphs
 Know what is meant by stratified sampling

5 
 Find a missing probability from a list or twoway table including algebraic terms
 Use tree diagrams to calculate the probability of two dependent events
 Construct cumulative frequency tables
 Interpret box plots to find median, quartiles, range and interquartile range and draw conclusions
 Produce box plots from raw data and identify outliers when given quartiles and median
 Use random numbers to get a sample

4 
 Record outcomes of events in a Venn Diagram
 Use more complex two way tables
 Construct frequency diagrams for grouped discrete data
 Find the median, mode and range from a stem and leaf diagram
 Find an estimate for the mean from a grouped frequency table
 Understand how sources of data may be biased
 Know the definition of random sampling
 Draw a line of best fit by eye and understand what it represents
 Understand that correlation does not imply causality
 Distinguish between positive, negative and zero correlation
 Use a line of best fit to predict values
 Describe the relationship between two variables

3 
 Draw a probability tree diagram
 Use tree diagrams to calculate the probability of two independent events
 Use and draw sample space diagrams
 Draw a frequency tree based on given information and use this to find probability and expected outcome
 Produce ordered stem and leaf diagrams (including back to back)
 Construct and use frequency polygons to compare sets of data
 Identify and explain anomalies (outliers) in a data set
 Recognise quantitative and qualitative data
 Identify possible sources of bias and plan to minimise it
 Understand what is meant by a sample and a population
 Understand primary and secondary data sources

2 
 Work out the probability of an event NOT happening
 Estimate the number of times an event will occur, given probability and number of trials
 Compare experimental and theoretical probabilities
 Record outcomes of events in a table
 Work out probabilities from frequency tables and twoway tables
 Construct grouped frequency tables
 Design a question for a questionnaire
 Criticise questions for a questionnaire
 Draw and interpret a scatter graph

1 
 Know that the probabilities of exhaustive events sum to 1
 Identify all the mutually exclusive outcomes of an event
 Calculate relative frequencies and use them to calculate expected outcomes
 Find probabilities for equally likely outcomes
 Know which is the best graph or chart to use
 Interpret data in a simple table
 Interpret frequency tables
 Group data in equal class intervals
 Design and use data collection sheets
 Complete a twoway table
 Draw pie charts
 Compare two simple distributions using range and median
 Compare two simple distributions using range and mean
 Calculate the mean from a simple frequency table
 Know which is the best average to use and when to use range
 Find range, modal class, interval containing the median and an estimate of the mean from a grouped frequency table
 From a pie chart find the mode and total frequency

W3 
 Use a probability scale with words
 Mark events on a probability scale
 Interpret line graphs
 Represent data in a table
 Draw and interpret bar charts (including dual bar charts)
 Draw pictograms
 Calculate the mean, median, mode and range from a list of data
 Find the modal class for a small set of grouped data
 Compare two simple distributions using range and mode
 Interpret simple pie charts

W2 
 Find the range of a small set of unordered data

W1 
 Find range from a set of ordered data
