Category Archives: Math 9

Misleading stats – Reflection

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This is a misleading graph because in this comparison, it looks as if Ms. Smith’s class has an average that is 5x better than Mr Jones’ class, but the truth is that Ms. Smith’s class and Mr. Jones’ class have a low average and they are both bad. OK I’m just kidding, It shows with the numbers that Ms Smith’s class only has a 0.8% higher average. Because they both start and a high number and whoever made this added as many values in between 73.0 and 74.0 to make it seem as if Ms. Smith’s class is 5x better than Mr. Jones’ class.

Thoughts on Data Analysis 2018

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1) I believe that statistics are very important in our society because it is the base of many facts, and of course facts are important because it (should be) is the truth. So statistics are a big part of how we find out about our world.

2) I learned that about 24% of statistics are mathematically flawed because when numbers are involved, the question of authority of that stat is usually not questioned. (Writing this after 3) I also learned that my made up statistic about statistics being made up on the spot was actually correct. Or so I have now read.

3) The problems with statistics is that they can be made up when told, did you know that 86% of statistics are made up on the spot? OK you probably got that that was made up but I think you understand my point. As well as when the study is being done, it is not done properly and there is a biased answer. Like if we asked only Winnipeg fans who they wanted to win the cup and our final outcome was that everybody wants Winnipeg to win.

Linear Relations Study

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Jobs chosen:

McDonald’s Crew Member

Starbucks Barista

______________________________

McDonald’s wage: 11.62 per hour

Starbucks’ wage: 11.03 per hour

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Starbucks

When working 4 hours a day, I would have to wait 250 days to save up to 1000. This works around my school and soccer schedule though so it would be the must.

McDonald’s

When working 4 hours a day, I would have to wait 252 days to save up to 1000 but at that point point, I would have made 7 dollars more than if I worked at Starbucks.

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Conclusion

I would have to chose working at Starbucks because at first it seems like it would take way more time to earn 1000 but because of where the numbers fall, it would actually come in less time.

Also, just the embarrassment of working at McDonald’s is enough to scare me to Starbucks. Not even if I make 7 more dollars.

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Planning sheet

Math-9-Linear-Relations-Study-McArthur-1atjp6g-qpy9n3

Everything I know about polynomials

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Vocabulary of polynomials

Coefficient: Number before a variable

Base: The variable after a coefficient

Variable: An unknown number shown by a letter

Term: A number or variable/the sum of a number and variable

Like terms: Two or more terms with the same base

Polynomials: An expression made up of terms that are added or subtracted

↓

Monomial: 1 term | 6x2

Binomial:   2 terms | 3a2 – 5

Trinomial:  3 terms | –w2 – 5w + 1

Polynomial: 4+ terms | 2s2 – t2 + st + 7t – 4

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Addition

Only like terms can be added

(1x + 2x2 – 3x)+(1x + 3x2 + 2x)

1x, 3x, 1x and 2x are like terms

1x + 3x +1x + 2x = 7x

2x2  and 3x2 are like terms

2x2 + 3x2  = 5x2

= 7x + 5x2

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Subtraction

Only like terms can be subtracted

(4x – 3x2)-(1x2 + 2x)

= 4x – 2x = 2x

= 3x2 – 1x2  = 2x2

= 2x – 2x2

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Multiplication

Using the distributive property, we multiply the monomial with each term in the polinomial.

(3x)(3x x 2x x 5x)

Multiply each term by the monomial

(9x2 + 6x2 + 15x)

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Division

Distributive property still applies

\frac{6x + 4x}{2x}

6x ÷ 2x = 3

4x ÷ 2x = 2

3+2

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Reflection

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