The letter α in the formula for constructing a confidence interval estimate of the population mean is:

A) the level of confidence.
B) the probability that a particular confidence interval will contain the population mean.
C) the area in the lower tail of the sampling distribution of the sample mean.
D) None of these choices.

Confidence Interval

A range of values, derived from sample statistics, that is used to estimate the true value of a population parameter with a certain level of confidence.

Population Mean

The average value of all the individuals or elements within a complete population.

Lower Tail

The lower tail of a distribution refers to the section of the distribution that contains the smaller values, often used in the context of probabilities and statistical significance.