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Topic: How much by hand.
Replies: 0

 AHankla@aol.com Posts: 132 Registered: 12/6/04
How much by hand.
Posted: Nov 4, 1996 11:25 PM

I'll answer "how much by hand" for std deviation and correlation
coefficients.
In my physics courses (15 years) and now in statistics, I have my
students calculate standard deviation for a set of repeated single variable
data of the physics-type. They take their own data and work it up as a lab.
A curve with the +/- 1, 2 and 3 std dev is drawn and a comparison made with
the empirical rule. After that they may use the computer to find std dev for
their labs.
Likewise, correlation coef and equation of the best fit line is done by
hand for a set of data. I derive the slope via calculus minimizing
technique on the deviations from the mean. (It is good for my calc students,
too.) They feel, and we discuss, the relationships among the slope, the std
devia of x and y, and the cor coef. After that they use the computer for
curvefitting to all curves. That's physics.
Alice
The Galloway School, Atlanta