A city transportation company (CTC) conducted a small sample study to estimate the utilization of bus stops in the city

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A city transportation company (CTC) conducted a small sample study to estimate the utilization of bus stops in the city. Three out of 20 city areas were sampled at random and then a few bus stops within these areas. The numbers of people using the bus stop over a specified hour in a specified weekday (weekend excluded) are given in the following table:

Sampled Area	Number of bus stops	Number of buys stops sampled	Sample average	Sample variance
1	45	9	82	30
2	36	7	80	20
3	20	4	56	30

a. Explain what type of sample design is used here.

b. Estimate the average number of people using a bus stop in one hour for the weekday per bus stop in the city. Is this estimator unbiased?

c. Place a bound on the error of the estimation.