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(Solved) The average age for licensed drivers in the county is µ = 40.3 years with a standard deviation of ơ = 13.2 years. A researcher obtained a random

Question: The average age for licensed drivers in the county is µ = 40.3 years with a standard deviation of ơ = 13.2 years.

  1. A researcher obtained a random sample of n = 16 parking tickets and computed an average age of M = 38.9 years for the drivers. Compute the z -score for the sample mean and find the probability of obtaining an average age this young or younger for a random sample of licensed drivers. Is it reasonable to conclude that this set of n = 16 people is a representative sample of licensed drivers?
  2. The same researcher obtained a random sample of n = 36 speeding tickets and computed an average age of M = 36.2 years for the drivers. Compute the z -score for the sample mean and find the probability of obtaining an average age this young or younger for a random sample of licensed drivers. Is it reasonable to conclude that this set of n = 36 people is a representative sample of licensed drivers?

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