Term
What are skewed distributions? Which way will the tail point in negatively and positively skewed distributions? 

Definition
Skewed distributions are those that contain tails and aren't symmetrical distributions. A negative skew would have a tail that points to the left a positive skew would have a tail that points to the right. 


Term
What is a bimodal distribution? 

Definition
A bimodal distribution is one that has two peaks with a valley in between. 


Term
How to calculate interquartile range and determining outliers from that 

Definition
Multiply n by 1/4 or 3/4 for 1st or 3rd quartiles respectively. If the number is a whole number, the quartile is the mean of the value at this position and the next highest position. If it is a decimal round up to the next whole number and take that as the quartile position. If a value falls more than 1.5 interquartile ranges outside the first or third quartiles it is considered an outlier. 


Term
What are the three typical causes of outliers? 

Definition
1. A true statistical anomaly (ie 7ft tall person) 2. A measurement error 3. A distribution not approximated by the normal distribution such as a skewed distribution with a long tail. 


Term
independent vs. dependent events 

Definition
independent events have no effect on one another while dependent events impact one another such that the order changes the probability. 


Term
mutually exclusive outcomes 

Definition
can't occur at the same time 


Term

Definition
when a group of outcomes includes all of the possible outcomes 


Term
How would you determine the probability of that only one of two independent events will occur? 

Definition
Add their independent probabilities together and subtract the product of their probabilities. 


Term
What do linear, parabolic, exponential and logarithmic graphs look like? 

Definition
linear  a line parabolic  a U exponential  logarithmic  

