Surveys
what is the word for a factor that skews the results of a survey?
bias
what is the probability of rolling a 2 on a dice?
1/6
expand 5!
5x4x3x2x1
what probability distribution would you use for calculating wait time?
geometric
what is range?
max - min
What is simple random sampling?
ex. drawing names from a hat
what operations do we do for the words "and" and "or"
and = x
or = +
what type of operation would you use for a question about forming groups/committees?
combinations
what probability distribution would use for calculating an exact number of successes and failures?
binomial
what is IQR?
Q3 - Q1
what type of data is collected from a survey question with the options "most likely" to "least likely"
ordinal
drawing two socks from a drawer without replacement is an example of what kind of events?
dependent
simplify (n+1)! / n!
n+1
how would you create a probability distribution for a given question?
calculate probability for each possible outcome and put into table/graph etc.
What is Q2?
The median
what is the difference between discrete and continuous data?
ex. discrete is counted, continuous is measured
if the probability of something is 2/5, what are the odds against that event happening?
3:2
use the formula to simplify and solve 6P4
6! / 2! = 360
what is the expected value formula for a "general" probability distribution?
E(x) = x1P(x1) + x2P(x2) + ....
How do you know when to use population mean and sample mean?
whether the data is from a whole population or just a sample
what type of sampling is asking every 5th person in your contacts?
stratified
what is included in "A intersect B" and what is the symbol?
A upside-down U B
all events that are in both
simplify and solve using the formula: 20C3
20! / 17!3! = 20x19x18 / 3x2x1 = 1140
if p = 3/7 in a geometric distribution, then what is the expected wait time?
4/3 = 1.333
what percentage of the data is found within 1 standard deviation of the mean in a normal distribution?
68%