Tag Archives: Mean

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

Posted in Descriptive statistics, Statistics | Tagged , , , , , , , , , , | Leave a comment

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

Posted in Descriptive statistics, Statistics | Tagged , , , , , , , , , , , | Leave a comment

The Tax Return of Mitt Romney

Mitt Romney is currently a candidate for the 2012 Republican Party nomination for U.S. President. He recently, bowed to pressure from another presidential candidate in the Republican Party, had to release his past tax returns. The release of these tax … Continue reading

Posted in Descriptive statistics, Statistics | Tagged , , , , , , , | Leave a comment

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

Posted in Descriptive statistics, Exploratory Data Analysis (EDA), Statistics | Tagged , , , , , , , , | Leave a comment

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

Posted in Descriptive statistics, Normal Distributions, Statistics | Tagged , , , , , , , , | Leave a comment

A Student’s View of the Normal Distribution

In my teaching, I always strive to encourage students to look at statistics from a practical point of view. In a recent class period covering the normal distribution, I indicated that data values more than 3 standard deviations away from … Continue reading

Posted in Commentary, Descriptive statistics, Normal Distributions, Statistics | Tagged , , , , , | 1 Comment

Interpreting ACT Scores

The ACT is a standardized test that is used for college and university admissions in the United States. According to their web site, the ACT test “assesses high school students’ general educational development and their ability to complete college-level work”. … Continue reading

Posted in Descriptive statistics, Statistics | Tagged , , , , , , | Leave a comment

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

Posted in Descriptive statistics, Statistics | Tagged , , , , , , , , , , | 1 Comment

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

Posted in Descriptive statistics, Statistics | Tagged , , , , , , , , , | Leave a comment

LA Rainfall Time Plot

In a previous post, we had an elementary look at the seasonal rainfall data in Los Angeles, California, using graphs (histograms) and numerical summaries to describe the data. The rainfall data were collected over time (total rainfall in inches over … Continue reading

Posted in Descriptive statistics, Statistics | Tagged , , , , , , | Leave a comment