Do one of the following, as appropriate: (a) Find the critical value Za/2. (b) find the critical value to / 2. (c) state that neither the normal nor the t distribution applies. 90%: n = 10: o is unknown; population appears to be normally distributed. O A. Za/2 - 1.383 O B. Za/2 - 2.262 O C. ta/2 - 1.833 OD. ta/2 - 1.812Use the given information to find the minimum sample size required to estimate an unknown population mean j. Next question How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 95% confidence that the sample mean is within 4 minutes of the population mean, and the population standard deviation is known to be 9 minutes OA. 20 O B. 14 OC. 34 O D. 28 Time DELLDo one of the following, as appropriate: (a) Find the critical value Za/2. (b) find the critical value to/ 2. (c) state that neither the normal nor the t distribution applies. Next question 95%, n = 11; o is known: population appears to be very skewed. O A. Za12= 1.812 OB. Za12- 196 O C. Neither the normal nor the t distribution applies OD. 1412= 2.228 Time Rema DELLThis question: 1 point(s) possible Use the given degree of confidence and sample data to construct a confidence interval for the population mean u. Assume that the population has a normal distribution Next question The football coach randomly selected ten players and timed how long each player took to perform a certain drill. The times (in minutes) were: 7.9 10.5 9 8 11.5 7 1 6.3 11.4 10.1 12.1 Determine a 95% confidence interval for the mean time for all players. O A. 10.93 min