Please help I do not know how to do right answer only.

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

Write the fraction or mixed number and the decimal shown by the model

How do you determine whether a relationship represented as as graph is linear or nonlinear