Confidence Intervals for Population Mean: Videos & Practice Problems

A logistics analyst records delivery times (in days) for a random sample of $n=30$ packages and finds a sample mean of $2.1$ days. Historical records for all deliveries show the true population mean delivery time is $2.3$ days. If we draw $1000$ bootstrap samples (each of size $30$ with replacement from the observed data) and compute their $1000$ sample means, those bootstrap means will tend to target:
a. $2.1$ days, the sample mean.
b. $2.3$ days, the true population mean.
c. Halfway between $2.1$ and $2.3$ (i.e., $2.2$ days).
d. The median delivery time of the observed sample.