Topic 1 - Statistical Analysis

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Author:
ENason
ID:
130972
Filename:
Topic 1 - Statistical Analysis
Updated:
2012-05-04 08:44:08
Tags:
IB DP BIO STATISTICS
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IB DP BIO - STATISTICS
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  1. What are error bars for?
    They are a graphical representation of the variability of the data
  2. What is standard deviation for?
    Summarize the spread of values around the mean. 68% of the values fall within one SD of the mean.
  3. How much data falls within 2 SD of the mean?
    98%
  4. What does a small standard deviation mean?
    Data is clustered around the mean value.
  5. What does a large standard deviation mean?
    There is a wider spread around the mean.
  6. What does the t-test do?
    • It uses the standard deviations of both sets of data to deduce the significance of the difference.
    • It helps scientists work out if the difference is significant or not.
  7. What are the 'degrees of freedom' if you have 2 samples, both with a population of 10?
    • Degrees of freedom are the sum of the samples ize of each of the two groups minus 2.
    • For example, if two groups of 10 plants each are being looked at, then 10 plus 10 is 20 minus 2 is 18. Thus, the number to look at in the ‘Degrees of freedom’ column is 18.

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