A researcher studies the average distance that 130 people who are living in U.S. urban areas walk each week.
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One can find a course for learning details on online statistics by going to the CMU website. Another place to find courses for learning details on statistics is the Berkeley website.
Check the SAMSHA website (national Substance Abuse Mental Health agency) for statistics for your state. It's probably a phone poll. Or, check the website for your state department of health.
z = (x - mean of x)/ std dev of x I thought this website was pretty good: http://www.jrigol.com/Statistics/TandZStatistics.htm
The two main branches of statistics is Descriptive statistics and inferential statistics.
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