Cushny and Peebles (1904) conducted a study on the effects of optical isomers of hyoscyamine hydrobromide in producing sleep. For one of the drugs, the additional hours of sleep for 10 patients were 0.7, −1.6, −0.2, −1.2, −0.1, 3.4, 3.7, .8, 0, and 2.

Compute the Harrell–Davis estimate of the median, the mean, the 10% and 20% trimmed means, and the M-estimate of location. Compute the corresponding standard errors.