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

Poppies in front field

4 2 3 0 3 1

Poppies in back field

3 0 0 1 3 0

Standard Deviation• To calculate standard deviation you

MUST know the following equation:

Standard deviation for front field

Number of poppies

Mean number

x - (x - )2

4 2.17 1.83 3.342 2.17 0.17 0.033 2.17 0.83 0.690 2.17 -2.17 4.713 2.17 0.83 0.691 2.17 -1.17 1.37Total 10.83

Standard deviation10.83

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).

Different types of variation

• Can you draw two graphs to represent your findings.

• We will look at theseLater 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.

attatched unattatchedllll llll llll ll llll llll ll

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)