Question 6 1 point A random sample of 20 observations was taken from population A sample mean of 80 and a sample varian confidence interval for population mean is No confidence interval can be constructed becaus 80 2 54 6 708 80 2 54 6 708 80 2 33 1 5 80 2 33 1 5 80 2 52 1 5 80 2 52 1 5 80 2 54 10 06 80 2 54 10 06