A random sample of size 15 taken from a normally distributed population revealed a sample mean of 75 and a sample variance of 25.The upper limit of a 95% confidence interval for the population mean would equal:

A) 77.77
B) 72.23
C) 88.85
D) 77.27

Confidence Interval

A span of numbers obtained from sample data, which probably includes the value of an unknown parameter from the overall population.

Sample Variance

A statistical measure that quantifies the degree to which sample points differ from the sample mean.

Population Mean

The arithmetic average of a set of values or a distribution in the entire population, representing the central location of the data.