A researcher plans to select a sample from each of the following populations. Which is likely to be a probability sample, and which is likely to be a nonprobability sample? a. The population consists...

A researcher plans to select a sample from each of the following populations. Which is likely to be a probability sample, and which is likely to be a nonprobability sample?

a. The population consists of the class of entering freshmen at a local college.

b. The population consists of 12-month-old infants.