Based on a random sample from a population, a researcher estimated that the mean value of a certain variable for the population is 20.5, with an associated margin of error of 1. Which of the following is the most appropriate conclusion?

Question

Accepted Answer

It is plausible that the actual mean value of the variable for the population is between 19.5 and 21.5.

Answer

It is not possible that the mean value of the variable for the population is less than 19.5 or greater than 21.5.

Answer

Every value of the variable in the population is between 19.5 and 21.5.

Answer

The mean value of the variable for the population is 20.5.