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# Variables in an Experiment. # of Variables in an Experiment In any experiment, you only want one variable that you vary from one group to the other. Trial.

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Variables in an Experiment

# of Variables in an Experiment In any experiment, you only want one variable that you vary from one group to the other. Trial Weight (g) Length of String (cm) Distance pulled back (cm) # of swings in 60 seconds Average Swings 1 14.7503068 69.2 2 14.7503070 3 14.7503071 4 14.7503069 5 14.7503068 1 49.3503072 70.4 2 49.3503070 3 49.3503069 4 49.3503071 5 49.3503070

The Variable you Manipulate The variable you want to have different between groups is called the independent variable. Trial Weight (g) Length of String (cm) Distance pulled back (cm) # of swings in 60 seconds Average Swings 1 14.7503068 69.2 2 14.7503070 3 14.7503071 4 14.7503069 5 14.7503068 1 49.3503072 70.4 2 49.3503070 3 49.3503069 4 49.3503071 5 49.3503070

The Variable you Measure There is another important variable, and this is the one you measure and expect to be different between groups. Trial Weight (g) Length of String (cm) Distance pulled back (cm) # of swings in 60 seconds Average Swings 1 14.7503068 69.2 2 14.7503070 3 14.7503071 4 14.7503069 5 14.7503068 1 49.3503072 70.4 2 49.3503070 3 49.3503069 4 49.3503071 5 49.3503070

The Variable you Measure This variable, the one you measure and expect to be affected by the independent variable is called the dependent variable. Trial Weight (g) Length of String (cm) Distance pulled back (cm) # of swings in 60 seconds Average Swings 1 14.7503068 69.2 2 14.7503070 3 14.7503071 4 14.7503069 5 14.7503068 1 49.3503072 70.4 2 49.3503070 3 49.3503069 4 49.3503071 5 49.3503070

The Variables you Control Any other variables in your experiment can be a problem. We do what we can to eliminate or control them by keeping them the same. Trial Weight (g) Length of String (cm) Distance pulled back (cm) # of swings in 60 seconds Average Swings 1 14.7503068 69.2 2 14.7503070 3 14.7503071 4 14.7503069 5 14.7503068 1 49.3503072 70.4 2 49.3503070 3 49.3503069 4 49.3503071 5 49.3503070

The Variables you Control These bad variables that we dont want in our experiment are called confounding variables. Trial Weight (g) Length of String (cm) Distance pulled back (cm) # of swings in 60 seconds Average Swings 1 14.7503068 69.2 2 14.7503070 3 14.7503071 4 14.7503069 5 14.7503068 1 49.3503072 70.4 2 49.3503070 3 49.3503069 4 49.3503071 5 49.3503070

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