Construct the empirical cumulative distribution function for the data set of bamboo shoot heights given in DS 6.6.5. Draw 95% confidence bands around the empirical cumulative distribution function. Analyze the median (or mean) shoot height using the sign test, the signed rank test, and the t-test. Is there any evidence that the median (or mean) shoot height is less than 35 cm? Which analysis method do you prefer? Summarize your conclusions.