2. Mung Bean Activity

3. Finding a ‘true’ average Somewhere in the pound of Mung beans is the ‘true average’ of the Mung Beans How many beans do you have to mass to get to the true average? – How many can you realistically mass? How do we know which of your averages is closest to the ‘true’ average?

4. Histogram

5. Histograms

6. Create a histogram for your data

7. Calculate the average mass of the mung beans and add it to your graph

8. Standard Deviation

10. Which data set would have a higher standard deviation? 0, 1, 1, 0, 1, 1, 1, 0 OR 1, 4, 1, 0, 6, 0, 1, 3

11. Standard Error of the Mean Standard deviation deals with the deviation from each individual measurement from the mean Standard error deals with the deviation of the mean from the ‘true’ mean

12. SEM Calculate your standard deviation and standard error of the mean and add these two your graph

13. 2SEM On the AP exam you will be expected to understand why we use ‘2xSEM’ on graphs Multiplying the standard error of the mean by 2 means we will be hitting 95% of our measurements – Also called a 95% confidence interval

15. Error Bars

16. If error bars overlap on the graph then the means are not statistically different If they DO NOT overlap then the means ARE statistically different

17. Example from an AP exam