Time on Facebook: Typical users of Facebook spend some time each day on Facebook. A sample of 50 Facebook users finds an average time per day on Facebook of 35 minutes with a standard deviation of 4.5. Give a best estimate for the time spent per day on Facebook, a margin of error for this estimate (with 95% confidence), and a 95% confidence interval. Interpret the confidence interval in context. What do we have to assume about the sample in order to have confidence in our estimate