Biology and Environment Science
The Virginia Cooperative Extension Service provides yield data and other performance statistics on barley as well as a summary of the growing season. A random sample of barley varieties was obtained and the 2013 yield ( y, in bushels per acre) and the date headed (x, number of days since the beginning of the calendar year at which 50% of the heads have emerged from the plants) are given in the following table.
|
Date headed
|
115
|
111
|
114
|
116
|
115
|
|
Yield
|
88
|
87
|
87
|
84
|
82
|
|
Date headed
|
120
|
119
|
113
|
112
|
119
|
|
Yield
|
82
|
81
|
78
|
82
|
81
|
a. Find the estimated regression line.
b. Complete the ANOVA table (without the p value).
c. Do you believe that the date headed is a good predictor of yield? Why or why not?