As you come in… • Pick 6 letters (A-J) and 6 numbers (between 1-10) generate a set of 5 coordinates you will measure in your quadrats. Why are you using a random coordinate generator then?
Now use your coordinates- Random sampling • Count the number of poppy’s at these coordinates in both locations. • Calculate a mean of the results • What was the range? (your highest and lowest result
Real difference in Standard deviation I am looking for differences between number of poppies in two different fields
Standard Deviation • To calculate standard deviation you MUST know the following equation:
Standard deviation 10.83 6 – 1 = 1.46 +/- (2.17) √ - 1
Is there real difference between your results? • Draw a number line under your calculations So standard deviation is the range of values around the mean of a set of results and can be compared to see if there is real difference between sets of results (this is where results overlap).
Can you draw two graphs to represent your findings. • We will look at these Later in the lesson. One will be a bar chart and one will be a line graph? Which set of data is discontinuous
How can we represent this on a graph…. • Can you write down whether your ear lobe’s are attached or not attatched • Can you also write down the length of your middle finger (cm) • Make a tally chart of these to sets of data for the whole class.
Back to your graphs… Can you draw a bell curve of your results for the length’s of middle fingers. How would you draw a graph for you ear lobes? What would it look like?
Homework • Questions 1 and 2 in booklets • Read pages 124-127 to consolidate knowledge (I also suggest you try the summary questions on page 127 to check your understanding)