Explanations on how to set it up would be great!
you so so much in
don't reply if you're unsure, i genuinely need ///:

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

Which of the following graphs could represent a cubic function?

Pls the last one and it has to be like number 6