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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
Yield
88
87
84
82
120
119
113
112
81
78
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?
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