IB Math 2 10/1/10

Agenda

· Reminders

· Homework Review

· Internal Assessment

!!For All Students that were not at school today (10-1-10) all make up points from the test are due Monday!!

Home Work (We went over EX 18B.2 Questions 1&2)

1. The scatter plot alongside shows the association between the number of cars crashes in which a casually occurred and total number of car crashes in each year from 1972 to 1994. Given that r value is 0.49:

A) Find r^2

R=0.49

So what you do is this .49x.49= r^2=0.240

B) Describe the association between these variables.

Its Weak

2. In an investigation to examine the association between the Tread depth (y mm) and the number of kilometers travelled (x thousand) a sample of 8 tyres of the same brand was taken and the result are given below.

Kilometers (x thousand)	14	17	24	34	35	37	38	39	L1
Tread depth (y mm)	5.7	6.5	4.0	.30	1.9	2.7	1.9	2.3	L2

A) Draw A Scatter plot of the data

To make a scatter plot

Use your calculator and press stat and enter in edit

Place the following numbers in the appropriate Colum as shown by the red marking on top

After you done that go to

2^nd Y= and have the first plot on and the rest off

Then go to window and type in

Xmin=10

Xmax=40

Xscl=2

Ymin=0

Ymax=7

Yscl=5

X res remains as is (1)

Then plot

B) R= .951

R^2= .+904

Internal Assessment

!!Due Monday!! 10/04/10

Everyone must bring in a plan for what you will want to do for your math internal assessment. Use the big packet that ms.s gave you! For an idea. You can Google math internal assessment for ideas.

!!Due Thursday!! 10/7/10

Using your plans that you brought on Monday. You must bring in how you are planning to do your internal assessment.