# (a) Enter the Excel function =ROUND(NORMINV(RAND(),70,10),0) in cells B1:B100. This will create 100.

(a) Enter the Excel function =ROUND(NORMINV(RAND(),70,10),0)
in cells B1:B100. This will create 100 random data points from a normal
distribution using parameters _ = 70 and _ = 10. Think of these
numbers as exam scores for 100 students. (b) Use the Excel functions
=AVERAGE(B1:B100) and =STDEV(B1:B100) to calculate the sample mean and standard
deviation for your data array. (c) Every time you press F9 you will get a new
sample. Press F9 five times and write down the sample mean and standard deviation.
(d) Compare the sample statistics with the desired parameters _ = 70 and
_ = 10. Do Excel
»

(a) Enter the Excel function =ROUND(NORMINV(RAND(),70,10),0)
in cells B1:B100. This will create 100 random data points from a normal
distribution using parameters _ = 70 and _ = 10. Think of these
numbers as exam scores for 100 students. (b) Use the Excel functions
=AVERAGE(B1:B100) and =STDEV(B1:B100) to calculate the sample mean and standard
deviation for your data array. (c) Every time you press F9 you will get a new
sample. Press F9 five times and write down the sample mean and standard deviation.
(d) Compare the sample statistics with the desired parameters _ = 70 and
_ = 10. Do Excels random samples have approximately the desired
characteristics? (e) Use Excels =MIN(B1:B100) and =MAX(B1:B100) to find the
range of your samples. Do the sample ranges look as you would expect from the
Empirical Rule?

»

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