Probability

For the past couple of days, we have been discussing tree diagrams

MATH

Math

Reducing Fractions

Math

Here's another

MATH

Adding fractions with different denominators

Math

Converting Fractions to Percents

Math

Here are some math videos that may prove useful

 

We need a rule for subtracting integers in order to solve this problem.



Rule: To subtract an integer, add its opposite.

Example 1: +5 - +2

Step 1: The opposite of +2 is -2.

Step 2: Subtraction becomes addition.

Solution: +5 - +2 = +5 + -2 = +3

Check out the videos below. They may be helpful.

MATH

ADDING INTEGERS



Check out the video below.

Math Review

A= base x height

Today's Math Lesson: Area of a Parallelogram
Nelson Math

Math

Stem- Leaf Plots

We have been reviewing stem- leaf plots. Look at the plot below and comment to answer the following questions.

1. How many people attended the family reunion ?
2. What is the age of the oldest person ?
3. What is the age of the youngest person ?
4. Did any teenagers attend?
5. How many people at the family reunion were in their fifties?

DATA MANAGEMENT

Statistics is the study of the ways data or information is collected, organized and interpreted.  This week, we studied the bias that can exist in the ways information is collected .  The expression “Lies, d* lies and statistics” refers to the way numbers can be used to mislead. Sometimes people try to persuade others using a false statistic.  Let me give an example. If I say that Ms. Babb is the best teacher in the world because I conducted a survey and found that 100 % of the people interviewed stated that I was the best teacher ever, this sounds pretty impressive, right!  But let’s look more closely at the survey. Who was surveyed? What is the population ?  What was the sample? If I spoke to 10 members of my own family, would you still believe that the statistic could give an accurate finding about who the best teacher was ?

As we discussed in class, surveys can be biased against or in favour of particular groups.  We talked about the differences between a census and a sample, and the importance of samples being representative of the population. 

 Here are some statistics. Comment below on any possible biases.  Are there any problems in how the data is being collected ?

1.     In an online study of 50, 000 homes in England, researchers found that 47% of the housewives do most of their shopping on the internet.

2.      Every third person at a local Good life gym was asked how regularly they exercised.  The survey concluded/found that Canadians work out 4 times per week.

3.     In a survey, every fifth person coming out of a Canadian police station was asked if they had ever been the victim of a violent crime.  The survey concluded that Canada is an extremely violent place, since there was a 7 out of 10 chance that someone in Canada would be the victim of a crime.