The "expense ratio" is a measure of the cost of managing the portfolio. This value is very important to investors because fund operating and management fees can have a large impact on net profitability of the investment. Below are expense ratios (in percentages) for 11 randomly chosen stock funds and 10 randomly chosen bond funds. Stock Fund 1.12 1.44 1.27 Bond Fund 1.75 0.99 1.45 1.66 0.51 0.92 0.64 0.69 1.19 1.22 0.99 3.18 1.21 0.20 1.14 0.68 0.40 0.94 At a=0.10, is there evidence that bond funds have offered lower expense ratios than stock funds? [15 marks]