Question
Monthly sales of a school's co-op for a particular year are as follows: January February March April May June 45,300 30,300 10,500 9,500 9,000 10,400
Monthly sales of a school's co-op for a particular year are as follows:
| January | February | March | April | May | June |
| 45,300 | 30,300 | 10,500 | 9,500 | 9,000 | 10,400 |
| July | August | September | October | November | December |
| 25,200 | 20,000 | 20,300 | 27,500 | 15,300 | 50,400 |
a). Calculate the mean and standard deviation of the co-op's sales.
b). Estimate confidence interval for mean of sales at 95 per cent level. Show and explain your working and interpret your answer
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Business Forecasting
Authors: John E. Hanke, Dean Wichern
9th edition
132301202, 978-0132301206
