What are the chances?
Which probability depends on another occurence?
Conditional probability
What is the meaning of a z score?
It is a way of telling you where you stand in the data set. Z = (X-mu)/sigma
What formula do we use for our standard error for means?
The square root of sigma over n
Which part of the R environment has the data saved?
Environment section
What is the union rule for probability?
P(AUB) = P(A) + P(B) - P(A int B)
If I want to find the area to the right how do I find that on the table (assuming the area to the left)
1 - probability of the table value area
What is the Central limit theorem?
We can assume the sampling distribution will be approximately normal if we have many samples (at least 25) even if there is some skewness. The bigger the better.
Which function in R gives the number of columns and rows and the information about the data types of the variables?
str()
How do you know when events A and B are independent?
When P(A|B) = P(A)
If I want to find the area between 2 values what do I do for z scores?
Find the z scores of both values, find the areas of both then subtract them
What is the equivalent of the sample mean in proportions?
What is a function in R we can use to filter records such as. the species in iris?
subset()
What is the value of the intersection when 2 events are disjoint?
0
What is the formula if I want to find an amount of something assuming I have a normally distributed data set and the z score?
What is the requirement for the Central limit theorem for proportions?
np>=5 and np(1-p)>=5
If you want to create a nice report in R what is a document you can use and what button do you click on to apply the template to create the report? (not tested)
R markdown, knit