# What the teacher knows about Pupil J's attainment in handling data

When setting up a survey, Pupil J designs suitable questions to capture the data he needs. He is beginning to consider the type of people to ask and how many people to ask so that his results are fair and representative. As well as collecting primary data, Pupil J uses the school's intranet and reference materials as a source of secondary data. For example, he has used statistics relating to the attendance at school of pupils in different year groups over a period of one month.

Pupil J creates graphs of grouped discrete data on paper and using ICT. He chooses appropriate equal class intervals that have no overlap. He interprets line graphs and pie charts from a variety of sources such as newspapers, travel brochures and materials from history and geography lessons. He tends to use the mode and range to compare sets of data although he knows how to find the median and calculate the mean of discrete data.

In probability, Pupil J completes two-way tables to show all possible outcomes. He uses the results to determine the theoretical probability of each outcome. He expresses probabilities using words, fractions or decimals. He places probabilities in order on a 0 to 1 scale. Pupil J understands that different outcomes may result from repeating an experiment. For example, having worked out the theoretical probabilities from throwing two dice and adding their scores, he experimented by throwing the two dice 50 times. He compared his results with othersâ€™ results and found that they varied. With the support of group discussion he explained that the more they all experimented, the closer their combined results might be to the theoretical probabilities.