Worksheet1 Ch 1 & 2
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Surname (e.g. “Straayer”), Given Name (e.g. “Dave”)
Here is some data on weights of
students in pounds. Enter it into a
list (L1) on your calculator.
Produce a “default” histogram by
the method I show in class. Sketch
it below, and label the axes
appropriately. Note how “random”
class boundaries are. Sketch the
graph with default class widths in
the left box below.
Wouldn’t classes of a nice even
width like 20, starting on whole
numbers like 140 and 160, be more reasonable? The calculator stores the class width in Xscl.
Now use the Window key to reset the Xmin to 100 and Xscl to 20, produce another histogram, and sketch and
label it. Use the Trace key to check the number of entries in the [140,160) class. Note how the display
confirms that the interval is closed on the left (includes 160) but open on the right (160 would go into the next
class). Now sketch the “nice” class width histogram in the right box.
Be sure to label axes, and include at least two numbers on each numerical axis.
“default” histogram
0 – 20 histogram.
Now do “Stat/Calc/1-Var Stats”. Find X-bar and Median on the output screen(s)
x-bar = __________________
median = __________________