A__is a rule that assigns each value of independent variable to exactly one value of the dependent variable

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

What is the measure of ac? 5 units 13 units 26 units 39 units

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)