02) The following data set shows the additional sleep in hours obtained by a random sample of 10 patients using laevohysocyamine hydrobromide. (10 points) 1.9 0.8 1.1 0.1 0.1 4.4 5.5 1.4 4.6 3.2 a) Calculate the sample mean, x. b) Calculate the sample standard deviation, s. c) By assuming the distribution of the variable is normal, obtain a 95% confidence interval for the additional sleep that would be obtained on average for all people using the above medicine. d) Interpret the 95% confidence interval obtained in part (c)