QUESTION 1 One feature smartphone manufacturers use in advertising is the amount of time one can talk before recharging the battery. Below are 13 values from a random sample of the talk-time (in minutes) of smartphones running on lithium-ion batteries. 316 358 739 606 1058 910 358 476 441 441 680 441 473 We wish to estimate the mean amount of time one can talk before recharging the battery with 90% confidence (minitab output below). Interpret the 90% CI. N Mean StDev SE Mean 90% Cl for p 13 561.3 226.8 62.9 (449.2, 673.4) H: mean of rtime O a. We are 90% confident that the sample mean amount of time one can talk before recharging the battery is between 449.2 and 673.3 minutes. O b. We are 90% confident that the mean amount of time one can talk before recharging the battery is between 449.2 and 673.4 minutes. O c. We are 90% confident that the mean amount of time one can talk before recharging the battery is between 561.3- 226.8 and 561.3+226.8 minutes. O d. There is a 90% chance of getting the mean amount of time one can talk before recharging the battery