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Analyzing Data Using Excel

Analyzing Data Using Excel. 1. Graphing Trendlines 2. Determining the validity of a graph and data. 1. Graphing trend lines. Using the data provided, construct a spreadsheet Create a graph, using the chart wizard. Select the chart and move to “chart”, then “select trendlines”.

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Analyzing Data Using Excel

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  1. Analyzing Data Using Excel 1. Graphing Trendlines 2. Determining the validity of a graph and data

  2. 1. Graphing trend lines • Using the data provided, construct a spreadsheet • Create a graph, using the chart wizard. • Select the chart and move to “chart”, then “select trendlines”

  3. 1. Graphing trend lines • Select the graph from the “type” menu tab that illustrates what your graph looks like • Select the options tab and select both: • “Display equation on chart” • “Display R squared value on chart” • Click OK • Click and move the equation and r squared value so you can read

  4. 1. Graphing trend lines • What does R square (R2) mean? • The closer the value to 1, generally the more valid the trend of data • If R square is below .5, then generally, the graph does not show a valid trend • If R square is low, try to repeat the process and select a different graph from the menu

  5. 2. Determining the validity of a graph and data: Things to consider *Look at your graph. • Does it make sense? • What did you originally think your graph would look like? • Did you make a data entry error? • How much data was collected?

  6. 2. Determining the validity of a graph and data: Things to consider • What variables may have affected the data? • The more variables, generally the less accurate the data. • Look at your graph and consider the variables that may have affected the data

  7. 2. Determining the validity of a graph and data: Things to consider • Was the data collection method accurate? • How was the data collected?

  8. 2. Determining the validity of a graph and data: Things to consider • The more data, the more accurate the analysis of the data • For example, 5 points of data will create a less accurate trend than 500 data points on a graph

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