Eli Orchid has designed a new pharmaceutical product, Orchid Relief, which improves the night sleep. Before initiating mass production of the product, Eli Orchid has been market-testing Orchid Relief in Orange County over the past 8 weeks. The daily demand values are recorded in the Excel file provided. Eli Orchid plans on using the sales data to predict sales for the upcoming week. An accurate forecast would be helpful in making arrangements for the company's production processes and designing promotions.

b. To use all three models: M1: d = 1.0356t + 339.29 M2: d = 0.7163t + 116.7679w + 315.0262 M3: (the one considering weekdays) to predict the demand for seven days ahead (Mon, Tue, ..., Sun) and find the total weekly demand. M1 M2 M3 Mon. Tue. Wed. Thu. Fri. Sat. Sun. TOTAL:

DayDateWeekdayDaily DemandWeekend14/25/2016Mon297024/26/2016Tue293034/27/2016Wed327044/28/2016Thu315054/29/2016Fri348064/30/2016Sat447175/1/2016Sun431185/2/2016Mon283095/3/2016Tue3260105/4/2016Wed3170115/5/2016Thu3450125/6/2016Fri3550135/7/2016Sat4281145/8/2016Sun4541155/9/2016Mon3050165/10/2016Tue3100175/11/2016Wed3500185/12/2016Thu3080195/13/2016Fri3660205/14/2016Sat4601215/15/2016Sun4271225/16/2016Mon2910235/17/2016Tue3250245/18/2016Wed3540255/19/2016Thu3220265/20/2016Fri4050275/21/2016Sat4421285/22/2016Sun4541295/23/2016Mon3180305/24/2016Tue2980315/25/2016Wed3550325/26/2016Thu3550335/27/2016Fri3740345/28/2016Sat4471355/29/2016Sun4631365/30/2016Mon2910375/31/2016Tue3190386/1/2016Wed3330396/2/2016Thu3390406/3/2016Fri4160416/4/2016Sat4751426/5/2016Sun4591436/6/2016Mon3190446/7/2016Tue3260456/8/2016Wed3560466/9/2016Thu3400476/10/2016Fri3950486/11/2016Sat4651496/12/2016Sun4531506/13/2016Mon3070516/14/2016Tue3240526/15/2016Wed3500536/16/2016Thu3480546/17/2016Fri3840556/18/2016Sat4741566/19/2016Sun4851

I need help on part bplease. Can you show me how to do it in excel? (Data given above)