Problems
Find AnB when setA=(numbers divisible by 3) and setB=(even numbers under 19).
A=(3,6,9,12,15,18...)
B=(2,4,6,8,10,12,14,16,18)
The numbers they have in common are (6,12,18), therefore AnB=(6,12,18).
Find C U D.
Set C = Numbers 1-20 that end with an e.
Set D = Numbers 1-20 that are odd.
Set C=1,3,5,9,12
Set D=1,3,5,7,9,11,13,15,17,19
Set C + Set D =1,3,5,7,9,11,12,13,15,17,19
P(A U B) meaning
What is probability of either event A or event B happening?
The numbers for the empirical rule.
What is 68-96-99.7
Best way to get the most accurate and unbiased response from a group.
What is making sure the group is randomized?
The chances of Bill making a hoop is 50% every time, what are the odds of him missing twice in a row.
0.50x0.50=0.25
25% chance of Bill missing two hoops in a row.
Dan asked all his friends their favorite music artist, 50% of his friends said that their favorite music artist was The Weeknd. He released a school article that claimed that 50% of the school's favorite artist is The Weeknd, is this claim correct?
No, only asking his friends means there is a bias. He would need to ask random people and more people in order to get the most accurate answer.
P(A n B) meaning.
What is when both events A and B will happen?
The purpose of a z-score.
What is an equation to find the probability on the z-chart?
Parts of an experiment.
what is introduction, research questions, methodology, results, and discussion?
Jim collected data that P(ketchup)=0.8 and P(mustard)=0.3, and P(ketchup or mustard) is 0.9. What is P(ketchup AND mustard)?
0.8(ketchup)+0.3(mustard)=1.1
1.1-0.9=0.2
P(ketchup+mustard)=0.2
At the fair, the mean time for a ride is about 10 minutes, and the standard deviation is about one minute. What percent of people will have to wait 8-12 minutes?
Because of the empirical rule,
12-10=2, 8-10=-2/
2/1=2, -2/1=-2
Within 2 standard deviations, meaning 95% of people wait 8-12 minutes.
A⊆B meaning.
What is All of A is in B, but not all of B is in A.
How to find the raw score.
What is z=(x-average)/standard deviation
The Margin of Error equation.
What is z x sqrt(p(1-p)/n)?