Prob & Stats - CCAC

If news in Athens, GA. God Bless the Dooley family.

We are saddened to hear of the passing of legendary Coach Vince Dooley. Our condolences are with his family and friends.

Beautiful!

The Duquesne Incline is maybe the best view in Pittsburgh, and Carolyn Doyle snapped a perfect shot for our Pennsylvania Nature Lovers group on Facebook!

This Fall I will be teaching Statistics again. So watch for new posts to this site.

Can you create a Cummulative Relative Frequency Graph for this data? How many data values are there in this Stem and Leaf table? Step 1: List the data values.

Today was my first day to substitute for a AP Statistics class at Georgia Cyber Academy. We discussed how to find Variance and Standard Deviation. Note: standard deviation = sqrt( variance )

Do you understand how to use the summation formula? We are squaring the difference from each "Observed - Expected" value. I did not write negative signs, because the values were being squared. Every expected value was 33.3, so we can add all the numerators over that common denominator. Any questions?

Goodness of Fit Answer. Any questions?

I see more students are "Liking" this page. So, I wanted to re-post an old challenge. Who can tell me what the 33.3 represents in this table? Note: If all of the values on the die are "Equally likely" and you roll it 200 times, you expect it will land on each value 200 / 6 times. Perform a "Goodness of Fit" test for this data. You will be calculating a chi-square value.

Goodness of Fit Problem.

Statistics Basics: Measure of Center - Median.
The median is the number at the middle of the data set. Half of the numbers will be below the median, half will be above it. Example: For the set: 3, 5, 7, 10, 13, 16, 24, 28, 35. The median is 13. If there are an even number of values, average the middle two. If 27 was added to this set, there would be 10 values. The Median will be ( 13 + 16 ) / 2 = 14.5. Five of the values are less than 14.5 and five are greater than 14.5. *** Always remember to put the values in order before finding the median.