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Collecting & Organizing Data

Collecting & Organizing Data. Notes on data. Data comes from your observations during your experiment Data can be collected in multiple ways: observing changes, measuring items, or weighing items. Usually, the best way to collect data is to use a data table . Rules for making data tables:.

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Collecting & Organizing Data

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  1. Collecting & Organizing Data

  2. Notes on data... • Data comes from your observations during your experiment • Data can be collected in multiple ways: observing changes, measuring items, or weighing items. • Usually, the best way to collect data is to use a data table.

  3. Rules for making data tables: • Every table MUST have a title. The title must contain the two variables of the experiment. • Every column or row should be labeled with a heading. • The unit of measurement that you’re using is written only in the heading.

  4. Rules for making data tables: Number of Cricket Chirps for Each Day of the Week • You must record your data in order • The title should be on top of your table

  5. Rules for Graphing • The most important rule is to determine which type of graph is best suited for your data. • Types of graphs: bar graph, line graph, scatter plot (or best fit line), and a pie graph

  6. Bar Graph • Use a bar graph when you are counting, tallying or grouping data. • The title of a bar graph is different because one of the variables is a word. • Example: The number of bluebirds attracted to different foods. • Example: All the students with grades between 80-100%

  7. Line Graph • Use a line graph when the variable you’re changing has a range from low to high • Example: Change in temperature to see effect on water evaporation • Use a line graph when you are recording data over a period of time • Example: days, minutes, seconds, months, years, etc.

  8. Scatter Plot/Line of Best Fit Graph • Use this graph when • More than one data point can be plotted on the y-axis for each data point on the x-axis • A line of best fit, trend line or slope line is added making an equal amount of points on either side of the graph

  9. Pie Graph • A pie graph is used when all of the data adds up to 100% • Each “slice” of the graph represents a percent that is from your data collection

  10. Review Alert! • Which variable goes on which axis? • Independent variable = x-axis • This is the variable you control • Dependent variable = y-axis • This is the variable that changes or responds to your independent variable • Time always goes on the x-axis!

  11. Another few pointers... • Label the axes of the graph with the variables used in the experiment • Be sure to include units of measurement when you are labeling • Title the graph! • Number your axes according to your data • Observe your low and high numbers • Determine the range • Each square must represent the same number of units

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