Explain what the scientific method is and what the different variables are in general (independent, dependent and control). Relate these variables to the experiment (e.g. independent variables are % alcohol or caffeine or experimental beverage, dependent variable is heart rate expressed in beats per minute). State your working hypothesis (alcohol decreases and caffeine increases Daphnia heart rate).
Results should be presented in the form of tables and graphs where appropriate. Should have 4 tables (see handout) and 3 graphs (% alcohol vs heart rate, % caffeine vs heart rate and % experimental beverage vs heart rate). Remember all tables and graphs should have a sentence explaining what is being shown and all graphs should have a title and both axes should be labeled.
Draw the best fitting line through the points NEVER join the dots also show the equation of the line (linear regression)!
All graphs should have a control value at 0 % beverage (x = 0, y = average control value) this value is the average control heart rate of Daphnia when distilled water was used (i.e. at 0% beverage concentration – this will be the same on all three graphs) remember and show all 3 control measurements in your results table.(20 points)
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