What seven trades can say

The seven signals of 15.1.7 had net R-multiples $0.018, 0.011, -0.952, -1.156, -1.005, -0.242, 1.871$. (a) Compute the sample mean, the sample standard deviation (divisor $N-1$) and the $t$-statistic for $H_0: E = 0$. (b) Suppose the true process has $E = 0.30R$ and $s = 1.36R$ (the breakout system of M03 · 3.1.1). How many trades are needed for $t \ge 2$ in expectation, and for an 80% probability of $t \ge 2$? (c) The scan produced seven signals in 17 months. How many years would the 80%-power sample take at that rate? What changes to the research design would shorten it, and what new problems does each change bring?