The lower limit of the 90% confidence interval for μ,where n = 64, = 70,and σ = 20,is 65.89.

Confidence Interval

Confidence interval is a range of values, derived from sample statistics, that is likely to contain the value of an unknown population parameter with a certain level of confidence.

Population Standard Deviation

Population standard deviation is a measure of the dispersion or variation in a set of values from a population, calculating how spread out the values are from the population mean.

Population Mean

The average value of all elements in a population, where the population represents the entire set of interest.