LT 6B My 5. After the Penny Wars, Mrs. Goolsby had a large selection of pennies. She curious what the oldest penny she had was and found the minimum year to be 1974. To investigate if the sample minimum is an unbiased estimator of the population minimum, 1000 SRSs of size n=20 were selected from the population of pennies. The sample minimum for each of these samples was recorded on the dotplot. The mean of the simulated sampling distribution is indicated by the thin line. Does the sample minimum appear to be an unbiased estimator of population minimum? Explain your reasoning