Question

A student wanted to construct a 95% confidence interval for the mean age of students in her statistics class. she randomly selected nine students. their average age was 19.1 years with a sample standard deviation of 1.5 years. what is the best point estimate for the population mean?

Answer 1

Point estimation includes the use of sample mean to compute a single value which is to help as a "best guess" or "best estimate" of an unidentified (fixed or random) population parameter.  Meaning the sample mean is the best point estimate of the population mean. Therefore, the answer is 19.1 because this is the sample mean in the problem.