Business, 19.05.2021 16:20 neko64

22 The average age for licensed drivers in the country is u = 42.6 years with a standard deviation of = 12. The distribution is approximately normal
a. A researcher obtained a sample of n = 25 drivers who received parking tickets. The average age
for these drivers was M = 40.5. Is this a reasonable outcome of a sample of n=25, or is the sample
mean very different from what would normally be expected? (Hint: Compute the z-score for the
sample mean )
b. The same researcher also obtained a sample of n = 12 drivers who received speeding tickets. The
average age for this sample was M = 34.4. Is this a reasonable outcome for a sample of n= 16, or is
the sample mean very different from what would usually be expected? (Again, compute the z-score
for the sample mean.)

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