Probability Basics
What are two other ways to express a probabilty of 50%?
1/2 and .5 or judge's discretion
True or False: A zero scores measures how heavy something is.
It measures it's weirdness
What is n?
sample size
What is the symbol for sample size?
n
Who sings "Poker Face"?
Lady Gaga
If the probablity of picking a blue marble is 18%, what is the probability of NOT picking a blue marble?
82% (100 - 18)
What is the z score formula?
(x - xbar)/s
What is s?
Standard Deviation
Why is sample size important?
Larger samples have less error.
Which band does Ms. Stauffer hate?
The Beatles
The Red Hot Chili Peppers
The Beastie Boys
TRHCP
What are the chances of rolling a one, then a two on a 6-sided die?
1/36 or about 3%
Can a z score be negative? If so, what would that mean?
Yes - it means the data point is below average;
What is x-bar?
mean or average
Does a larger sample make an estimate more or less precise?
More precise.
What is the periodic table symbol for mercury?
Hg
What the symbol for sample proportion?
p-hat
Given N(50, 12). Find the z-score of a score of 60. Round to two decimal places.
.83
What does p-hat represent?
Sample proportion
What does this formula measure?
sqrt((p*(1-p))/n
Sampling error or standard error, or just error!
What is ichthyology?
The study of fish
What is the probability of a having a z-score between -2 and 2?
95%
Why is it impossible to find the z-score of favorite color?
Favorite color is categorical and z-score is for numberical variables.
Flashback: 1/2mv2 is the formula for which physics term?
Kinetic energy
If the population proportion of seniors at a huge university is .15, what is the standard error in a sample of 200 students?
Round to 2 decimal places
.03
Explain to a 6th grade what "pi" is? (Hint: you must talk about a circle)
How many diameters wrap around a circle. (Or teacher's discretion)