You have been employed as the newest member of our guest speaker's Traffic Analysis team. pedestrian volumes were collected every hour within a 24-hr day. The volumes were collected in April, in an urban region of Toronto.

The following table shows the data taken from a sample of 1 day: Pedestrian volumes 271 218 170 103 671 1871 2598 2978 3844 4785 4002 4511 4220 4301 3230 3580 4617 4821 3544 3781 2984 1077 408 411

a) Calculate the sample mean b) Calculate the sample standard deviation c) Calculate the confidence interval for 95% level of confidence to estimate the mean daily volume d) Interpret the result e) Would the above mean volume estimation be accurate all year round? Explain why or why not.