# unit4 family letter

Dear Parents, Next week, we will start a new Maths unit: Data Analysis. This unit is about data analysis and probability. The students will develop skills collecting, representing, describing, and interpreting data.

This unit has five mathematical foci:

1. Sorting and classifying data
• Grouping data into categories based on similar attributes
• Sorting the same set of data in different ways
• Sorting a set of data by two attributes at one time

The students will look at similarities and differences among individuals in a group and decide which of many attributes to attend to as they engage in sorting. Then they will apply these ideas to work with categorical data. By classifying these data they will use the same data to see a variety of information.

1. Representing data
• Representing data sorted into categories
• Comparing representations of a set of data
• Using equation to show how the sum of the responses in each category equals the total responses collected
• Using Venn diagrams
• Ordering, representing and describing a set of numerical data
• Representing data on a line plot

The students will use a variety of representations. They will pay attention to what the data mean and how to organise the data so that they can describe them. The students will also be introduced to line plots and other frequency distributions in which each piece of data is represented by one symbol e.g., an X, a square.

1. Describing data
• Describing what the data show
• Interpreting a data
• Describing important features of a data set
• Comparing two sets of data
• Developing a hypothesis based on a set of data

Second graders will begin to describe the data set as a whole rather than only the counts at each value. They are encouraged to notice what is going on in a data set overall.

1. Designing and carrying out a data investigation
• Making a plan for collecting data
• Making predictions about data to be collected
• Collecting and recording data from a survey
• Interpreting and sharing results from a data investigation

Data are collected in context and with authentic purpose – to learn how maths applies to the real  world. By making predictions and then collecting their own data, the students see how data are used – to answer a question or to cite evidence about an issue.

1. Knowing addition combinations to 10+10
• Achieving fluency with the Plus 10 combinations

To develop efficient computation strategies the students need to become fluent with the addition combinations up to 10+10 and the plus 10 Combinations e.g., 10+3, 10+4