Consider the expense ratio and the total one-year rate of return on the W&R family of mutual funds in Table 11.3.6.
a. What percentage of the variation in rate of return is explained by expense ratio? Please provide both the name of the measure and its numeric value.
b. Based on this information, how different is the rate of return for Core EqC from what you would expect for a fund with its expense ratio? Please provide both the name of the measure and its numeric value.
c. Find the equation to predict rate of return from expense ratio. Please enter rates of return as percentage points (so 11.2% would be entered as 11.2).
d. Is the regression coefficient significant in the equation to predict rate of return from expense ratio? Please give the result and a brief justification.

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TABLE 11.3.6 Expense Ratio and One-Year Rate of Return Fund AssetsS Core Eqc HilncC Int GthC LtdTrmC MuniC ScTechC SmCapGrC Expense Ratio 2.24 1.98 2.17 2.37 1.81 1.98 2.20 2.11 Return 11.2% 1.2 -41.6 9.2 9.9 -50.3 -33.3