Which term is a single value that best describes the population of interest, with the sample mean being the most common?

Which term is a single value that best describes the population of interest, with the sample mean being the most common?

• A. Point Estimate
• B. Confidence Level
• C. Interval Estimate
• D. Margin of Error

Answer: (A)

A point estimate is a single value used to estimate an unknown population parameter. The sample mean is the most common point estimate for the population mean because it summarizes the data with one number and, on average, equals the true mean when repeated samples are taken. The other terms describe different ideas: a confidence level is the probability that a constructed interval contains the true parameter; an interval estimate is that whole range of values; and the margin of error is the half-width of that interval, indicating how precise the estimate is. In practice, you compute x-bar as the point estimate for mu, and you may wrap it in a confidence interval to express uncertainty.

A point estimate is a single value used to estimate an unknown population parameter. The sample mean is the most common point estimate for the population mean because it summarizes the data with one number and, on average, equals the true mean when repeated samples are taken. The other terms describe different ideas: a confidence level is the probability that a constructed interval contains the true parameter; an interval estimate is that whole range of values; and the margin of error is the half-width of that interval, indicating how precise the estimate is. In practice, you compute x-bar as the point estimate for mu, and you may wrap it in a confidence interval to express uncertainty.