Extracting and Interpreting Data from Different Graphical Forms

Extracting and Interpreting Data from Different Graphical Forms

Understanding Graphical Forms

  • Recognise bar graphs: used to display categorical data and compare different groups.
  • Know that line graphs depict trends or changes over a specified interval, typically time.
  • Understand scatter plots: used to show the relationship between two variables.
  • Familiarise with pie charts as a way to view categories as parts of a whole.
  • Recognise histograms, like bar graphs but show continuous data, often in ranges.

Reading Graphical Data

  • Accurately read values from graphical data presentations, taking note of labelled axes.
  • Estimate values between two points on a graph in cases of non-integer or non-specific values.
  • Recognise a trend and be able to explain it within the context of the question.
  • Check whether graphs have units clearly stated in their labels before deriving any conclusions from the graph.

Interpreting Graphical Data

  • Understand how to analyse a bar graph. Look at the lengths of the bars to compare different categories.
  • Be able to interpret a line graph. Identify trends such as line slope and intercept.
  • Know how to analyse a scatter plot. Determine whether it implies a positive, negative, or no correlation.
  • Understand how to interpret a pie chart, making relative comparisons based on the size of sections.
  • Analyse a histogram, recognising the range, frequency, and any patterns that become apparent.

Correlation Coefficient

  • Understand the meaning of the correlation coefficient, which quantitatively describes the direction and strength of the relationship between two variables.
  • Recognise that correlation coefficients range from -1 to 1. -1 means a strong negative correlation, 0 means no correlation, and 1 means a strong positive correlation.

Displaying Information in Graphical Form

  • Know how to create a bar graph using collected data: categories on x-axis, frequencies on y-axis.
  • Be able to draw a line graph to display trends over time or any other continuous variable.
  • Construct a scatter plot to show relationship between two variables.
  • Create a pie chart to represent categories as parts of a whole.
  • Understand how to plot a histogram to show frequency distribution of continuous data.