What  Customers Are Saying  About  the Excel Statistical Master "We just started building statistical excel spreadsheets for our direct mail and online marketing campaigns, I purchased Excel Statistical Master to help fill in some of the blanks. Little did I know, this book has everything I could ever want to know about business statistics. Easy to follow and written so even a child could understand some of the most complex statistical theories. Thanks Mark!" Brandon Congleton Marketing Director www.worldprinting.com "After years of searching for a simplified statistics book, I found the Excel Statistical Master. Unlike the indecipherable jargon in the countless books I have wasted money on, the language in this book is plain and easy to understand. This is the best \$40 I have ever spent. " Mahdi Raghfar "I really like the Excel Statistical Master. It is incredibly useful. The explanations and videos in the manual are excellent. It has really made my work with statistics a LOT easier. I'm really glad that I came across the manual. If you're a student of business statistics, this e-manual is worth WAY more it's priced. I will use your manual as a reference for my MBA course this summer." Dr. Yan Qin Co-Director Nankai-Grossman Center for Health Economics and Medical Insurance
Excel
STATISTICAL
Master

t-Distribution Definition
for the Graduate Student and Business Manager

Clear and Complete - WITH LOTS OF SOLVED PROBLEMS

# t-Distribution Definition

The t distribution, sometimes referred to as the students t or student t distribution, is similar in appearance to the normal distribution. The t distribution's probability density looks very much like the normal distribution's bell shaped curve with a mean = 0 standard deviation = 1. As the t distribution's degrees of freedom increases, the t-distribution's PDF (probability density function) more and more closely resembles the PDF of the normalized normal distribution (mean = 0 and standard deviation = 1).

The t distribution has only one parameter - its degrees of freedom. The t distribution does not have as parameters the mean and standard deviation as the normal distribution. This gives the t distribution unique importance.

The ratio Z / SQRT( V / ѵ ) is t distributed and has ѵ degrees of freedom. Z is normally distributed with a mean of 0 and a standard deviation of 1. V is chi-square distributed with ѵ degrees of freedom.

The t distribution is often substituted for the normal distribution because it is shaped like the normal distribution but its tails or lower and thicker. This allows for the inclusion of outliers that are difficult to identify and remove.

If You Like This, Then Share It...