3. Hypothesis Testing - 2L PP

# Label both axes and include units graph details 4 use

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Unformatted text preview: you measured) 3. Label both axes and include units Graph Details 4. Use easy to read and even increments on both axes 5. Plot the points (use EXCEL) 6. Do NOT “connect the dots” - use a ‘best-fit’ or ‘trendline’ Graph Details 7. Use real graph paper: Fit figure on paper Fig 1. Growth of oaks over time Data Analysis Descriptive Statistics * Describe the population of data points collected Population vs. Sample: A sample is a small subset representative of a population Mean: Average of a series of data points Standard Deviation: This value shows you how far from the mean the data spreads. * Uses the same units as the mean * Represented as Mean ± StDev n ∑( x * Use standard deviation to plot error bars: StDev = i − x) i−1 n −1 Data Analysis Once you have calculated descriptive statistics (mean and standard deviation) you can use these values to determine which of your hypotheses should be rejected Evaluate how similar the results of two treatments really are Using descriptive statistics: Standard deviation + 2.1 from the mean - 2.1 from the mean StDev = 2.1 Average Number of fruits produced 1. Plot the mean and standard deviation for you data 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Not fertilized Fertilized Using descriptive statistics: Average Number of fruits produced 2. Determine the amount of overlap between the error bars of the control and treatment Do the error bars overlap? 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 --YES Is there a statistically significant difference between the number of fruits produced in the treatment (fertilized soil) and control (unfertilized soil)? --NO!! Not fertilized Fertilized Using descriptive statistics: 2b. Determine the amount of overlap between these treatments Do the error bars overlap between Maple and Oak? - NO Is there a statistical difference in the growth rate of Maple and Oak? -YES!!!! What about...
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## This note was uploaded on 03/23/2014 for the course BIOL 1005 taught by Professor Ta during the Spring '07 term at LSU.

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