Suppose that we wanted to estimate the true average number of customer visits to

Question

Suppose that we wanted to estimate the true average number of customer visits to a particular restaurant with 95% confidence. The margin of error we are willing to accept is 0.5. Suppose we also estimate that the population standard deviation is 10.

If our estimate is wrong and the variability in the population is higher,

A) the required sample size will increase

B) the required sample size will not be affected

C) our confidence will be lower

D) our confidence will be higher

E) the required sample size will decrease

Explanation / Answer

If variability is higher, standard deviation will be higher.

This means the required sample size should also be higher to make sure the margin of error does not go too high.

The correct answer is A)

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