Measures of Central Tendency
How do you calculate the mean?
Dot Plots show __(how many?)_ piece of data.
EVERY
A right skewed graph has low or high outlier(s)
high
What are the two main measures of center?
Mean and Median
What are the three measures of spread?
IQR, Range, Standard Deviation
How do you calculate the median?
Arrange numbers from smallest to largest, then find the middle number.
An outlier can be a max or min in a box plot
False
True or False: if a graph is symmetrical the mean and median are equal.
true
Always, Sometimes or Never
A right skewed graph has a median<mean.
Always
Which measure of spread is used for approx symmetric data?
The Standard Deviation
What is the mode?
The number that occurs the most often.
What is the 5-number summary?
Minimum, First Quartile, Median, Third Quartile, Maximum
Is the mean or median affected more by outliers?
mean
Which measure of spread is NOT affected by outliers?
The median.
Which measure of spread is NOT affected by outliers?
The Interquartile Range.
How do you find the median with an even set of data?
Find the Mean(average) of the two middle values.
How much % of the data is in 1 quartile?
25%
is 12 an outlier in the following data set?
1, 3, 3, 5, 8, 12
no
Skewed left means the tail is longer on the...
Skewed right means the tail is longer on the...
Skewed left means the tail is longer on the left.
Skewed right means the tail is longer on the right.
What is the IQR for the following distribution?
1, 3, 3, 5, 8, 12
5
How do you find the first and third quartile?
Find the medians of the upper and lower half.
Box plots show a brief ___ of the ___.
Summary, Spread
What are the upper and lower fences for the following data when calculuting outlioers?
1, 3, 3, 5, 8, 12
-4.5 and 15.5
The shape of the data can be described three different ways. What are the three ways we describe the shape of the data?
Normally Distributed, Skewed Left, Skewed Right
Find the standard deviation
1, 3, 3, 5, 8, 12
3.681