6 5 points We are formulating a 95% confidence interval for u, the mean amount of data usage among a particular segment of smartphone users. It is known that as regards data usage, this population is normally distributed. In our random sample of n = 25 observations, we observe a sample mean () of 2.4 GB and a sample standard deviation (s) of 0.3876 GB. Which of the following confidence intervals would be the proper one? O 2.18