Question 1 1 pts Suppose that after sampling a population, we estimate some mean u and compute a 90% condence interval to be [9.5, 9.8]. Which interpretation is correct? 0 With probability 0.90, the probability that our estimate is equal to the true proportion p. is between 9.5 and 9.8 0 With probability 0.90 the true proportion it lies between 9.5 and 9.8 Q We have sampled the same population repeatedly and estimated p. each time, and 90% of the time our estimates have been between 9.5 and 9.8 Q If we sampled the same population repeatedly and estimated it each time, 90% of the time u should lie within the condence interval Question 2 1 pts An independent random sample is selected from an approximately normal population with unknown standard deviation. Find the degrees of freedom (df) and the critical t-value (t) for the given sample size and confidence level (CL): n=15; CL=85% O df = 15; t = 1.75 O df = 14; t = 1.35 O df = 14; t = 1.52 O df = 15; t = 1.52Question 5 2 pts A 95% confidence interval for a population mean, is given as (16.98, 19.01). This confidence interval is based on a simple random sample of 20 observations. Calculate the sample mean and standard deviation. (Assume that all conditions necessary for inference are satisfied. Use the t- distribution in any calculations) O mean=17.995; sd=2.347 O mean=18.795; sd=2.00 O mean=19.00; sd=1.97 mean=17.995; sd=2.169Question 6 2 pts Suppose in an experiment we flip a coin (with 0.1