Tax Efficiency. Following are the data on percentage of investments in energy securities and tax efficiency from Exercise 15.22.

x 3.1 3.2 3.7 4.3 4.0 5.5 6.7 7.4 7.4 10.6 y 98.1 94.7 92.0 89.8 87.5 85.0 82.0 77.8 72.1 53.5 At the 2.5% significance level, do the data provide sufficient evidence to conclude that percentage of investments in energy securities and tax efficiency are negatively linearly correlated for mutual fund portfolios?