The need to knows:
If you are ever asked to describe the distribution of a data set, what is the method you should use?
What is CUSS and BS?
C: Center
U: Unusual Features
S: Shape
S: Spread
BS: BE SPECIFIC
Interpret Slope.
For ever 1 (x unit) increase in the x, there is a predicted ______ (y units) increase/decrease in the y.
If you are making a conclusion for a significance test, how would you interpret the p-value if it was greater than ⍺.
Because the p-value ____ > ⍺=_____, we fail to reject H0. There is not convincing evidence that (Ha in context).
What is a SRS?
A SRS is a simple random sample. This means that each member if the population has an equal chance if being chosen for the sample.
A car comes in 3 different body styles and 5 different colors. How many possible options are there?
15 options
What is the 10% Condition?
This condition is checked by verifying that the sample size is no more than 10% of the population size when sampling without replacement.
Interpret y-intercept.
When x is 0 (x units), the predicted y is _____ (y units).
If you are making a conclusion for a significance test, how would you interpret the p-value if it was less than ⍺.
Because the p-value ____ > ⍺=_____, we reject H0. There is convincing evidence that (Ha in context).
What is bias?
Unintentionally overestimating or underestimating the true defined value.
Freshman GPAs at Dodgeland High School have a mean of 2.93 and standard devation of .39. What is the probability a student has a GPA of between 2 and 3?
.5627
What is the Central Limit Theorem?
When the sampling size of "n" is sufficiently large (n>=30), the sampling distribution of the sample mean xbar is approximately normal
Interpret Standard Deviation.
The values in the distribution typically differ from the mean by about ____ (units)
Interpret a confidence level C.
In repeated random sampling of size n=___, about C% of C% confidence intervals capture the parameter.
What is a cluster random sample?
A random sample conducted by randomly choosing clusters and including each member of the selected clusters in the sample.
The average person has 3.64 car collision claims in their lifetime with a standard deviation of 1.11. If Anna is in the bottom 20% of claims, how many claims has Anna had?
2.71 claims
What is the Large Counts Condition?
It states that the sampling distribution of p-hat will be approximately normal when n*p>=10 and n(1-p)>=10.
Interpret the correlation coefficient.
The correlation coefficient _____ shows a positive/negative, weak/moderate/strong linear relationship between (x units) and (y units).
Interpret a C% confidence interval.
We are C% confident that the true population (parameter) of (context) is between ___ and ___.
What is a systematic random sample?
A sample where individuals are "lined up" then they are chosen for the sample based off of every "nth" individual to be in the "line".
How many ways can I choose 8 papers to grade out of a class of 30 students?
5852925 ways
What is the name of each variable? (You have to know all to get full points)
(μ) (𝜎) (Sx) (𝒑) (x-bar) (p-hat)
μ: population mean
𝜎: population SD
Sx: Sample SD
𝒑: population proportion
x-bar: sample mean
p-hat: sample proportion
Interpret the coefficient of determination.
_____% of the variation in the (y units) can be explained by a linear relationship with the (x units).
Interpret Type 1 and Type 2 Errors.
Type 1: We find convincing evidence that (Ha in context) Ha is not true.
Type 2: We do not find convincing evidence that (Ha in context) when Ha is actually true.
What is a Stratified Random Sample
A random sample conducted by randomly choosing an SRS from each stratus and combining these groups into one sample.
What is the probability of pulling a red or a Queen from a standard deck of cards.
28/52