Download Normal Distributions on the ClassPad

Normal Distributions on the ClassPad
GETTING READY
A) Open the Statistics Application (I).
B) Select Edit and then Clear All.
C) If there is something already open in Statistics; make sure you save it if you want to keep it. If not,
select OK when prompted with the Clear All menu.
EXAMPLE
From a random sample of thermometers find the probability that a given thermometer would read
between -2.2° and 1.1° when trying to measure the freezing point of water. This is a standard normal
distribution.
Tip: Note that in a standard normal distribution, μ=0 and σ=1.
1) Select Calc, Distribution from the menu. This
will open a dialog box. In the second dropdown
menu within the dialog box, select Normal CD
and tap Next.
2) Enter in the Lower and Upper z-values given in
the problem. (The ClassPad will default to a
standard normal distribution and will fill in μ
and σ with the values for this type of
distribution.)
Tip: If you are ever working with a
non-standard normal distribution,
note that you can change the
values for μ and σ as needed.
3) Tap Next. We see that the probability is
approximately 0.85.
4) Now tap $. What do you notice?
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YOUR TURN #1:
From a random sample of thermometers find the probability that a given thermometer would read
between -1.7° and 1.0° when trying to measure the freezing point of water. This is a standard normal
distribution.
Use the ClassPad and the example above to help you.
Probability:
Sketch the graph with shading: (include z-values, and area values)
0
YOUR TURN #2:
From a random sample of thermometers find the probability that a given thermometer would read
between -0.5° and 0.5° when trying to measure the freezing point of water. This is a standard normal
distribution.
Use the ClassPad and the example above to help you.
Probability:
Sketch the graph with shading: (include z-values, and area values)
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INTERPRET YOUR FINDINGS:
What do your results tell you? Hint: Think about what happens to the probability as the interval between the
lower and upper z-values decreases.
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