You have been employed as the newest member of our guest speakers Traffic Analysis team.

Bike volumes, pedestrian volumes, and vehicle 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:

Bike volumes	Pedestrian volumes	Vehicle volumes
15	271	358
0	218	382
2	170	480
7	103	581
9	671	755
22	1871	810
101	2598	874
229	2978	1200
300	3844	1789
289	4785	1611
211	4002	1608
189	4511	1583
477	4220	1420
415	4301	1443
388	3230	1211
274	3580	1287
108	4617	981
177	4821	872
192	3544	813
98	3781	765
56	2984	497
34	1077	487
0	408	351

0

411

277

Task 1 :

Select ONLY ONE of the three volumes given in the above table.

Perform the given calculations below (2 marks each)

You may use Microsoft Excel or perform calculations by hand.

You only need to state the final answer.

Calculate the sample mean

Calculate the sample standard deviation

Calculate the confidence interval for 95% level of confidence to estimate the mean daily volume

Interpret the result

Would the above mean volume estimation be accurate all year round?

Explain why or why not.