QUESTION 1 1 points Save Answer Suppose you take a random sample of n = 80 Douglas College students and ask each student their age. You find that the mean age of students in this sample is x=22.0375 years and the sample standard deviation is s = 3.2014 years. Based on this study, what is the best point estimate of the population mean age, u, of all Douglas College students? Enter your answer rounded to four decimal places. QUESTION 2 10 points Save Answer The 95% confidence interval for the mean age u of all Douglas College students is from years to years. You can find this either by calculating the critical t value ta/ or by using Statcrunch. QUESTION 3 1 points Save Answer In order to apply the procedure in Questions 1 and 2, certain conditions must be met. Which of the following are sufficient conditions and are also true (to the best of our knowledge) for this study of Douglas College students' ages? Select all that apply. y is a normal variable O n2 30 O np 25 O ng 25