3P Cruise using "Backyard Logs"
| Tree # | Est. Vol. (BYLs) | Random # | Meas. Vol. (m3) | Ratio (meas. / est.) | Tree Dia. |
| 1 | 2.5 | 5 | |||
| 2 | 4 | 15 | |||
| 3 | 10 | 10 | 0.83 | ||
| 4 | 6.5 | 9 | |||
| 5 | 3 | 26 | |||
| 6 | 2 | 30 | |||
| 7 | 21 | 20 | 1.53 | ||
| 8 | 13.5 | 2 | 1.10 | ||
| 9 | 4 | 9 | |||
| 10 | 16.5 | 18 | |||
| 11 | 12 | 22 | |||
| 12 | 4 | 1 | 0.36 | ||
| 13 | 1.5 | 15 | |||
| 14 | 16 | 18 | |||
| 15 | 4 | 21 | |||
| 16 | 8 | 6 | 0.54 | ||
| 17 | 19 | 25 | |||
| 18 | 24.5 | 24 | 2.11 | ||
| 19 | 6 | 7 | |||
| 20 | 2 | 28 | |||
Real Volume = Total Est. Vol. (BYL) * ave. R
R = meas. / est. = m3 / BYL ... thus the BYL will "cancel out" leaving the answer in m3.
Statistics
Since you estimated a value for EVERY tree there is NO sampling error (or standard error)
Since the sample is really the few trees that were measured, that is where we calculate the sampling (and standard) error
so ... calculate stats (sd, CV, SE & E) using the R values
the SE% & E% for R also applies
to the Real Volume
Calculate the confidence interval (@95%) for this timber cruise.