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Tag Archives: 5-number summary
Looking at Spread
In the previous post Two Statisticians in a Battlefield, we discussed the importance of reporting a spread in addition to an average when describing data. In this post we look at three specific notions of spread. They are measures that … Continue reading
Two Statisticians in a Battlefield
Two soldiers, both statisticians, were fighting side by side in a battlefield. They spotted an enemy soldier and they both fired their rifles. One statistician soldier fired one foot to the left of the enemy soldier and the other statistician … Continue reading
Another Look at LA Rainfall
In two previous posts, we examined the annual rainfall data in Los Angeles (see Looking at LA Rainfall Data and LA Rainfall Time Plot). The data we examined in these two post contain 132 years worth of annual rainfall data … Continue reading
Comparing Growth Charts
Suppose both an 8-year old boy and a 10-year old boy are 54 inches tall (four feet six inches). Physically they are of the same heights. But a better way to compare is to find out where each boy stands … Continue reading
The Safest Driving City in America
Which city in America has the worst drivers? When I asked this questions, many people guessed New York or Los Angeles. How about the city with the safest drivers? According to a recent report released by The Allstate Insurance Company, … Continue reading
Choosing a High School
Many parents try to find the best high school for their children. Many variables are usually involved in choosing a school. One criterion is to look at successes of the graduates of a school. One measure of success may be … Continue reading
When Bill Gates Walks into a Bar
The mean of a data set is obtained by summing the data elements in the data set and divided by the total number of data elements (what most people think of as average). The median of a data set is … Continue reading
Fortune Global 500
The Fortune Global 500 is a list of the largest 500 companies worldwide ranked by revenue. The list is compiled and published annually by Fortune magazine. In the 2011 list for Fortune Global 500, the top company is Wal-Mart Stores, … Continue reading
Looking at LA Rainfall Data
This is a demonstration of using descriptive statistics (using graphs and numerical summaries) to make sense of a one-variable data set (the seasonal rainfall data in Los Angeles). The techniques we use are frequency distribution, histogram, and various numerical summaries. … Continue reading
Weight Distributions of Super Bowl Players
How much do Howard Green and Ryan Pickett weigh (both of Green Bay Packers)? How much does Chris Kemoeatu weigh (Pittsburgh Steelers)? These are the heaviest players in the two teams for the Super Bowl 2011. Their weights listed at … Continue reading
Introductory Statistics 