Homework for next week – P1 Thursday

http://plus.maths.org/content/all-about-averages

Go onto the above websites on this and the next slide. Read the article & watch the videos and write a summary of what you have read/seen (must be at least 2 side of A4). You will peer mark your reviews next lesson with SIR comments.

https://www.youtube.com/watch?v=kLmzxmRcUTo

Peter Donnelly: How stats fool juries

I will put this PowerPoint onto SMH so you have all the information about this homework and the other details about the course.

Homework – SIR comments

Next week’s Homework

Go onto SMH.

Complete the following two practical activities:

1, 3, 14, 5, 6, 12, 18, 7, 23, 10, 5, 14, 0.

Finding the Median, Quartiles and IQR

For the above data set find:

Find the median.

Find the lower quarter (Lower Quartile)

Find the upper quarter (Upper Quartile)

Calculate the difference between the Lower and Upper Quarter (Inter-quartile Range)

Mini Review

Focus: Splitting data into quarters – the Quartiles.

A – Find the Quartiles for a data set.

M – Represent the data set in a cumulative frequency graph and use the graph to find the quartiles.

S – Draw a Box plot showing the quartiles.

Why does the spread of the data matter?

This is the wrong strategy for the company to follow. In your teams discuss why.

Quartiles – a measure of the spread about the mean

On mini white boards sketch what the graph showing the length of 100 randomly select dog might look like.

Why does the spread of the data matter in this situation?

Box Plots or Box and Whiskers Diagrams – a Recap

What is this graph showing?

The dog jacket problem... estimate what the cumulative frequency and box plot would look like for your 100 randomly selected dogs

Use your estimates to help you decide what size jackets the company should offer.

The owner of a pet shop wants to order 50 dog jackets. How many of each size would you recommend getting?

Review of Progress

Complete the following sentences:

- Quartiles are...

- Measuring the spread of the data is important because...