# Question

a. What is an estimator?

b. What is an estimate?

c. A sample standard deviation is found to be 13.8. Is this number an estimator or an estimate of the population standard deviation?

d. What is the error of estimation? When you estimate an unknown number, do you know the size of this error or not?

b. What is an estimate?

c. A sample standard deviation is found to be 13.8. Is this number an estimator or an estimate of the population standard deviation?

d. What is the error of estimation? When you estimate an unknown number, do you know the size of this error or not?

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