The following table contains the demand from the last 12 months:

Quarter	Sales
1	600
2	1550
3	1800
4	2100
5	2400
6	3100
7	2600
8	2905
9	3800
10	4500
11	4100
12	4900

a. Please use simple linear regression to forecast the next 4 quarter demand. [You need to generate the regression report and calculate the next 4 quarters' forecasting demand]

b. Please write down the linear regression model.

c. Based on the simple linear regression results, please answer the following questions: 1) What % of the variation in the data is explained by the model? 2) Is there a significant relationship between demand and quarter (significance level =0.05)? (yes or no)