1.+Statistics

1. Statistics

 * Assessment statements** (IBO notes added to some points to clearly indicate what needs to be understood and what does not)
 * 1.1.1 || State that error bars are a graphical representation of the variability of data. ||
 * 1.1.2 || Calculate the mean and standard deviation of a set of values. Memorisation of the formulae is not required ||
 * 1.1.3 || State that the term standard deviation is used to summarize the spread of values around the mean, and that 68% of the values fall within one standard deviation of the mean. ||
 * 1.1.4 || Explain how the standard deviation is useful for comparing the means and the spread of data between two or more samples. ||
 * 1.1.5 || Deduce the significance of the difference between two sets of data using calculated values for t and the appropriate tables. Only a two-tailed, unpaired t-test is expected. ||
 * 1.1.6 || Explain that the existence of a correlation does not establish that there is a causal relationship between two variables. ||


 * Statistical Analysis and Data Processing/Presentation**

This topic is in two parts, the first part is covered by the assessments statements and provides understanding of key ideas necessary for data processing:

The second part addresses how you are likely to use statistics in Biology labs throughout the course.

Before starting make sure you either have a version of MS Excel that has the custom error bars feature (this is missing in 2008 for OSX) or an alternative such as Calc from [|OpenOffice.org] (It's free too!! Aqua is the best version for OSX): media type="custom" key="24091142"
 * [|This resource] also [|this resource from click4biology] show how to plot error bars in Excel 2007, but is relevant to later versions too
 * See below for instructions on how to draw error bars in Open Office

Download the updated [|Essential Biology 01 Statistical Analysis] from i-Biology. We will work through this in class in conjunction with Steve Taylor’s presentation: media type="custom" key="24091140"
 * Lesson 1: Statistics**

This video by Jason De Nys is helpful if you are struggling to add error bars to your graphs in Excel


 * Lesson 2: Graph Drawing and Curve fitting**

In this lesson we'll be looking at data processing techniques (such as reaction rates and % change), presenting data and drawing curves of best-fit