Chapter 2 Describing distributions with Numbers Flashcards
What is the mean?
The average which is calculated adding all of the numbers up and dividing by the amount of numbers there are
The mean is considered the ____ _____ of the distribution
Balance point
What is the median (M) ?
The midpoint of a distribution
If even: the average of the two middle numbers
if odd: the middle number
When getting the median do you need to rearrange the numbers in numerical order?
Yes
Can outliers influence the mean?
Yes the mean is not a resistant measure of center
Is the median (M) a resistant measure of center?
Yes, it will change but less than the mean
which one would be more affected by an outlier?
a: mean
b: median
a: mean
If a distribution is roughly symmetric that means the mean and median (M) are _____
close together
If a distribution is completely symmetric that means the mean and median (M) are _____
exactly the same
If something is right skewed that means the mean is _____ than the median (M)
higher
If something is left skewed that means the mean is ____ than the median (M)
lower
Which measure of center is most appropriate for heavily skewed data sets?
The median (M) since it is not affected by outliers as much as the mean
What is the first quartile (Q1) in a sample?
The quartile that has 25% of the data at or below it (to the left of the median (M))
What is the second quartile (Q2) in a sample?
the median (M)
What is the third quartile (Q3) in a sample?
The quartile that has 75% of the data at or below it (to the right of median (M))
