Ref to Q 1: https://www.chegg.com/homework-help/questions-and-answers/dry-goods-sales-data-weekly-sales-dry-goods-department-wal-mart-store-northeast-peak-value-q24805903

Q 2: Modeling the data quadratically - a. Generate a quadratic model for this data. b. What is the marginal revenue for this department using this model? c. Calculate the model generated relative max/min value. Show backup analytical work. d. Compare actual and model generated relative max/min value.

Data:

		Dry Goods Sales
The data is for weekly sales in the dry goods department at a Wal*Mart store in the Northeast. Peak values, I.e. spikes, usually occur at holiday periods. Week 1 is the first week of February 2002. To show continuity, week 1 of 2003 is represented as week 54 since week 53 represents the end of fiscal 2002 and start of the 2003 fiscal year. Dollar values are adjusted in order to disguise true sales figures, but trends in the data are retained for analysis puposes.
										Week			Sales in $
										26			15200
										27			15600
										28			16400
										29			15600
30			14200
31			14400
32			16400
33			15200
34			14400
35			13800
36			15000
37			14100
38			14400
39			14000
40			15600
41			15000
42			14400
43			17800
44			15000
45			15200
46			15800
47			18600
48			15400
49			15500
50			16800
51			18700
52			21400
53			20900
54			18800
55			22400
56			19400
57			20000
58			18100
59			18000
60			19600
61			19000
62			19200
63			18000
64			17600
65			17200
66			19800
67			19600
68			19600
69			20000
70			20800
71			22800
72			23000
73			20800
74			25000
75			30600
76			24000
77			21200