Question: A simple random sample of five gasoline stations vvas taken in a mediumsize city containing 30 such stations. Within each of these five sample stations,

A simple random sample of five gasoline stations vvas taken in a mediumsize city containing 30 such stations. Within each of these five sample stations, a mobile unit with equipment to collect urine and saliva specimens was set up, and a sample of 1 in 10 automobiles entering the station was taken.

a. Based on these data, estimate the number of drivers in the city who show evidence of substance abuse.

b. Is the estimate used above unbiased? Show that it is/is not.
If it is not unbiased, what further information would be needed to construct an unbiased estimate?

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