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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.
 Hypothesis Testing [04/22/1999]

Why when the pvalue is lower does the null hypothesis value fall more
easily in the 95% confidence interval?
 Ice Skating Scoring [01/27/2001]

Why does the U.S. Figure Skating Championship use only five scores out of
the seven given by judges?
 The Idea behind zscores, and Their Relation to Standard Deviation [06/24/2010]

A student familiar with the definition of zscores wonders why we use standard
deviations to calculate them. Illustrating two ways, Doctor Peterson explains the
concept of scaling that motivates this statistical measure.
 Independence of Mean and Variance of a Sample [12/14/2008]

If a random sample is taken from a normal distribution, the mean and
variance of that sample are independent. Further, this independence is
only true for normal distributions. I don't understand how they can be
independent when they are from the same sample values.
 Interpolation Polynomials and Linear Regression [10/09/1998]

I need to find the polynomial of a temperature curve using some data I
have gathered.
 Interpreting a Correlation [08/06/2004]

Does a correlation of 0.60 between teacher attire and student academic
performance indicate that encouraging teachers to be properly attired
will increase academic performance?
 Interpreting ChiSquared Test Results [10/26/2004]

The critical values for chisquared increase as the confidence level
increases. My question is why does a distribution "pass" this test if
the calculated value is less than the critical value and not viceversa?
 Interpreting Coefficients of Correlation [07/01/2004]

Given a coefficient of correlation of r = 0.66, state what percent of
variation in y is due to the variation in x.
 Interpreting Stemplots [05/11/1998]

What does a stemplot represent, and how does it relate to the overall
population?
 Interquartile Range and Standard Deviation [11/24/1997]

What are some uses of interquartile range and standard deviation?
 An Introduction to Exponential Growth [10/07/2006]

What exactly is exponential growth? I see an equation in my book, but
I'm not sure what it means or how it works.
 IQ Scores by Category [7/28/1996]

Suppose an IQ test is given to a large group of people. Find the percent
of people whose IQ scores fall into the following categories...
 IQ Tests and Standard Deviation [7/28/1996]

On standard IQ tests, the mean is 100, with a standard deviation of 15.
Find the percent of people whose IQ scores are greater than 115...
 Is There a Mode when All Data Points Occur Equally? [05/02/2007]

If you have a set of data such as {2, 15, 20, 39, 56, 67} is there a
mode, and if so, what would it be?
 Lagrange Interpolation [08/20/2003]

I am trying to learn Lagrange interpolation.
 Large Standard Deviations [12/24/1997]

Is there a way to calculate the percent values derived from the ztable
without using the table, i.e. a formula?
 The Law of Large Numbers [02/08/2001]

Can you give me a brief explanation of the law of large numbers?
 Lifespan Probability [03/26/1999]

The probability that a general population will live past 85 is estimated
to be 5.4 percent...
 Line of Best Fit Using Least Squares Method [06/08/2005]

Can you give me a basic explanation of the math behind the method of
finding the line of best fit using the least squares regression?
 Local Modes and Bimodal Distributions [10/22/2000]

What does it mean if a frequency distribution shows two peaks?
 Manipulated and Responding Variables [01/13/2002]

What are manipulated variables and responding variables?
 Margin of Error: Who Figures into It? [11/09/2011]

A pollster wonders how to calculate margin of error. Does the population size even
play a role, or do you need only the sample size? Lacking actual results from the questionnaire, Doctor Wilko still provides guidance with explanations and examples, before returning to address the question about sufficient information.
 Mean and Standard Deviation [03/01/1999]

Prove that the mean (u) and standard deviation (s) for a binomial
distribution are np and the square root of (npq).
 Mean, Average, and Standard Deviation [04/18/2001]

Why is the average of means of three groups not always equal to the mean
of the three groups put together?
 Mean Less Than Median [08/17/2003]

Can you draw any valid conclusions about a set of data in which the
mean is less than the median?
 Mean, Median, and Mode [07/15/1998]

Can you explain the three ways to represent a group  mean, median, and mode? I am having trouble understanding the mode.
 Mean, Median, and Mode in Real Life [12/21/1996]

What are some real life examples involving mean, median, and mode?
 Mean, Median, Mode: Find Five Numbers [05/10/2001]

The median of five numbers is 15. The mode is 6. The mean is 12. What are
the five numbers?
 Mean or Median? [11/02/2003]

How do you decide whether to use the mean or the median to describe a
set of data? Why would one be higher or lower than the other?
 Median and Middle [5/15/1996]

I would like to know how to find the median of two of the same numbers (2
and 2).
 Mode, Mean, and Median in Stemplots [02/21/2002]

How do I find a mode, mean, and median, using a stem/leaf plot?
 Mode of a Uniform Distribution [09/06/2000]

What is the mode of a set of numbers, if none of the numbers repeat
themselves? What about a set like {1,1,2,2,3,3}?
 More Living or Dead? [08/14/1997]

Are there more people living now than have ever died?
 More Than One Mode? [10/07/2002]

Can a data set have more than one mode?
 New Pension Plan [07/15/1999]

Is there an relation between age and an employee's opinion of the new
plan?
 Normal Distribution [6/24/1996]

In six successive independent 'triple jumps' what is the probability that
at least one total distance will exceed 18 meters?
 Normal Distribution Curve [11/13/2000]

What is the normal distribution curve?
 Null Hypothesis, Deviation [08/05/1997]

A statistician believes that on the average the members of a group of
people weigh 120 pounds...
 One Chicken, One Day [04/19/2002]

If a chicken and a half lays an egg and a half in a day and a half,
how many eggs can one chicken lay in one day?
 One Tailed, Two Tailed tTests [09/11/1998]

What is the difference between a onetailed and twotailed t test?
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