The sweetness,y, of the fruit is supposed to be related to the average daily sunshine hours,x. The following data shows the sweetness of the same type of fruit at different locations (sunshine hours). Fit the data to a simple linear regression model.

x: 5, 6, 7, 6, 6, 8, 7, 5.

y: 9, 10, 10, 11, 12, 13, 12, 8.

xi=50,yi=85,xiyi=541,xi2=320,yi2=923.

1.Find the estimated regression line.

2.Predict the true mean sweetness for average daily hours of 7 hours.

3.Complete the ANOVA table for this regression model, and perform an Ftest for the model significance.= 0.05.

4.Conduct atestH0:1=0,H0:10 for the regression. Solve by reject region method.?=0.05.