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Browse High School Statistics
Stars indicate particularly interesting answers or good places to begin browsing.

Selected answers to common questions:
    Mean, median, mode, range.
    Statistics glossaries.
    Weighted averages.

Averages with Examples [10/17/2001]
My teacher has explained three ways to figure out averages, kind of like weighted averages, but without the weight...

Calculating Breast Cancer Survival Rates [06/30/2003]
Survival of a group of breast cancer patients is 100 at year 0, 100*X at year 1, 100*X*X at year 2, 100*X*X*X at year three and so on to year 10. How do I find the nth year survival?

Chi-Square Test [04/24/2002]
Four chiropractors examine a patient... I have calculated the number of times the chiropractors agree for any combination of 2, 3, and all 4; I need to compare this finding to that of chance probability of agreement.

Grade and Test Averages [12/02/2001]

Measures of Dispersion [6/30/1996]

Questions About Standard Deviation [9/20/1995]
Why does a standard deviation take the square root of the average of the sum of the squared differences between X and X mean instead of the average of the absolute value differences? What is the reasoning behind dividing by n vs. n-1 in the population versus sample standard deviations?

Sample and Population Standard Deviation [03/03/2001]
What letters represent theoretical and 'real' standard deviation, mean, and variance?

Information on stem and leaf plots and scatter plots.

Using the Range to Find Outliers [09/11/2001]
How can you use the range of a set of numbers to determine whether any of the observations were outliers?

Weighted Averages [11/02/1998]
Can you explain the concept of weighted averages, with examples?

20 Golf Players [04/11/1997]

Analyzing Survey Results [05/04/2000]
How can I determine a ranking of priority (1st, 2nd, 3rd, etc.) for the results of a satisfaction survey that asked people to rank, in order of importance, seven factors?

Applications of Arithmetic, Geometric, Harmonic, and Quadratic Means [11/22/2006]
How do I choose what sort of mean to calculate for a given set of data?

Are Two Formulas for Finding Standard Deviation the Same? [10/29/2007]
My statistics text gives a shortcut formula for calculating sample SD as the square root of [(the sum of x^2) minus (the sum of x)^2/n all divided by n-1]. Is this really just another form of the full formula?

Arithmetic vs. Geometric Mean [03/27/2001]

Arrangements of Letters [09/14/1999]

Average of Ratios vs. Ratio of Averages [10/24/2003]
We currently calculate 'Average dollars per square foot' as the ratio of the average price divided by the average square footage of all the homes in the list. It seems to me that it should be calculated as the average of the price-per-square-foot ratio of each house. Can you think of any reason why the ratio of the averages would be more useful than the average of the ratios?


Averaging Averages [11/09/1999]
How can I average the results of a survey sent to 5 different departments if I only have averages from each department?

Averaging Kelly's Test Scores [01/07/2002]

Bar Graphs and Histograms [04/30/2008]

Bar Graphs vs. Histograms [09/05/2002]
What is the difference between bar graphs and histograms?

Batting Averages [05/07/1999]
How do you calculate batting averages? Do you have to average the new hit into all the previous hits?

Bayesians and Frequentists [08/21/2001]
What is the difference between Bayesian and "regular" statistics?

Benford's Law [08/06/1998]
What is Benford's law?

Best Line Fit: Least Squares [03/23/1997]
What is least squares fitting? How exactly does one do it?

Biased and Unbiased Surveys [11/05/2008]

Binomial and Normal Distribution [06/09/1999]
Could you please tell me the difference between normal approximation to binomial distibution and normal distribution?

Binomial Distribution [8/25/1996]

Binomial Experiments [09/05/2003]

Box and Whisker Plots [02/13/2000]

Box and Whisker Plots [05/18/2000]

Calculating a Grade Average [08/15/1999]

Calculating and Interpreting Expected and Chi-Square Tables [04/10/1998]
How do you calculate the expected frequency and chi-square value of a 3- by-3 table?

Calculating and Interpreting Z-Scores [12/13/2005]
Please help me by providing a step-by-step process for calculating the z-score, or standard score.

Calculating Average Starting Time [06/23/2003]

Calculating a Weighted Average Grade [05/05/2000]

Calculating Percentage Errors [02/20/1999]
How do you calculate percent error from a set of data that includes predicted values and observed values?

Calculating Percentage of Errors [03/21/2002]

Calculating Percentile Rank [04/30/2009]
When calculating percentile rank, if more than one data value matches the number you are calculating, why do you count only half of them?

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