Chapter+2

Relative Frequency Tables and Histograms....
Remember the class width formula is (M-m)÷(# of classes). Always round this number up! (even if it's whole) Also, a class width of 15, means there are 15 numbers in the class including the lowest number. So if the low data value is 10 and the c.w. is 15, the first class goes from 10 to 24.

Midpoint is (class M + class m) ÷ 2. Usually you can just find the first class midpoint then add the c.w. to each class below, but again, if you "stretch" the final class to make the data fit, the final midpoint value will not fit the pattern.

Relative frequency is //f// ÷ n, rounded to wherever you choose (except the math majors...you guys give me like 23 decimal places!)

Cumulative frequency is a running total of the frequency column.

When you label the x-axis for the histogram, don't forget to make your .5 adjustments for each class.

Pareto Charts...
I like these and want you realize the practical value of the 80-20 rule. In general is means 80% of the contributions come from 20% of the contributors. The book mentions that of the 10 richest people in the world, the top three combined have more money than the other seven combined. So more like 70-30, but still significant. If the file downloaded, enter your contributors from greatest to least and the output will show you where the approximate 80-20 cut off is.

Circles and Bar Graphs...
These are fine for when your kids get to junior high. They will be wicked impressed by your computer skills when you show them how to make them in Excel. As for college-level math, they are not all that important.

Stem-and-Leaf (see, it's hyphenated) Diagrams...
The file worked from my computer, but you may be having a "macros" issue if it won't work for you. I have know idea was a "macros" issue is, I am simply quoting my district technology coordinator. Don't panic either way. I don't see these getting much playing time on the test.