Thoughts on Data Analysis 2017

http://www.truthpizza.org/logic/stats.htm

I think the role statistics have in our society is to inform people on the subject a given topic, and possibly influence people to change their opinions on the given topic.

I learned more about the importance of statistics in our society such as general information for safety and everyday life. For example, the percentage of people who survive car crashes when wearing seat belts to the percentage who survive that don’t.

The problems with statistics are that they can be merely made up,  there can be bad sampling, unfair poll questions, and misleading statistics.

11.1 Factors Affecting Data Collection

https://en.wikipedia.org/wiki/Nova_Scotia_Sunday_shopping_referendum,_2004

When I first read the article, I thought it was merely highlighting the point that a referendum on Sunday shopping in Nova Scotia resulted in the majority voting for “no”.

After learning the influencing factors, I now think there was some bias preferencing the “no” vote as the second question was, “If there is to be Sunday shopping, should it be on every Sunday or on only the six Sundays before Christmas?” This shows bias because they’re highlighting the idea of limiting Sunday shopping.

In the future, when reading and interpreting survey data I will more thoroughly analyse the influencing factors such as bias, ethics, and cost.

 

Your Money Matters

Three things that I spend money on each month are food, clothing and my iPad, as I pay my parents $20 per month. These are fixed expenses.

 

Three things that I spend money on each month are entertainment, sporting equipment and school related purchases. These are variable expenses.

 

Today my parents created chequing accounts for my sibling and I. They’ll deposit $20 into our accounts each week. To save money, we’re only allowed to withdraw $100 per day. I can also spend less or no money on unneeded purchases.

 

I could save $30 in a month without giving up too much.

 

 

Exponent Laws

One of the exponent laws I’ve learned this week is multiplying and dividing exponents with the same base. 

 

Multiplication

Rule) When multiplying two exponents with the same base, you add the exponents.

Example

  • 1² · 1²
  • = 1(² ᐩ ²)
  • = 1⁴

 

Division

Rule) When dividing two exponents with the same base, you subtract the exponents.

Example

  • 1² ÷ 1²
  • = 1

Word Problems with Fractions

At Thanksgiving dinner, there is a pumpkin pie for dessert. Kaitlyn eats 1/4 0f the pie, then 1/4 of the remaining pie. How much pie is left?

1 x 1/4 = 1/4 (how much pie Kaitlyn eats the 1st time)

1 – 1/4 = 3/4 (how much pie is left after Kaitlyn eats 1/4)

3/4 x 1/4 = 3/16 (how much pie Kaitlyn eats the 2nd time)

3/4 – 3/16

= 3 x 4/4 x 4 – 3/16

= 12/16 – 3/16

= 9/16 (how much pie is left after Kaitlyn eats the 2nd time)

9/16 of the pie is left.