Hypothetically speaking if Walmart does close down its register at 10:00 pm than it would not only disrupt the transactions of its own customers but also have an impact on the overall logistics and supply chain of the franchise. We can quantify the effects of closing down the registers at 10 pm using simple statistical tools such as mean, median and mode. To begin with we would first collect data of all the transactions which might occur post 10 pm. These transactions would then be added and a mean would be calculated to provide the average number of transactions that take place on a daily basis. The following data table is a sample tabulation of model data that might mimic the transaction history of Walmart sales after 10 pm.
Transaction Details for Walmart Sales After 10 PM
| Transaction ID | Date | Item | Price |
| 6954 | 10/3/2015 | GBC Poly Designer Binding Covers | 19.4184 |
| 6955 | 10/3/2015 | HTC One Mini | 50.396 |
| 6956 | 5/2/2015 | Laser & Ink Jet Business Envelopes | 9.8164 |
| 6957 | 7/19/2016 | Cardinal Holdit Data Disk Pockets | 17.108 |
| 6958 | 7/19/2016 | Howard Miller 13-3/4" Diameter Brushed Chrome Round Wall Clock | 15.525 |
| 6959 | 9/29/2015 | Personal Filing Tote with Lid, Black/Gray | 4.3428 |
| 6960 | 9/29/2015 | Xerox 1916 | 73.41 |
| 6961 | 9/29/2015 | Xerox 226 | 6.2208 |
| 6962 | 11/10/2017 | 12 Colored Short Pencils | 2.106 |
| 6963 | 7/20/2016 | Poly String Tie Envelopes | 4.794 |
| 6964 | 7/20/2016 | Eberhard Faber 3 1/2" Golf Pencils | 5.58 |
| 6965 | 7/20/2016 | Wilson Jones Turn Tabs Binder Tool for Ring Binders | 11.086 |
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These tabulated transaction details can be used to determine a null hypothesis on whether the sales closing Walmart after 10 would induce cost benefits that outweigh the total sales the store does once the designated period is over. To answer this queries Standard Deviate and Arithmetic means are employed and calculated using the following notation.
Arithmetic Mean & Standard Deviation
