Kruuk et al
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Kruuk et al. (1989) used a stratified sample to estimate the number of otter (Lutra lutra) dens along the 1400-km coastline of Shetland, UK. The coastline was divided into 242 (237 that were not predominantly buildings) 5-km sections, and each section was assigned to the stratum whose terrain type predominated. Then the sections were chosen randomly from the sections in each stratum. In each section chosen, the investigators counted the total number of dens in a 110-m-wide strip along the coast. The data are in file otters . csv. The population sizes for the strata are as follows: Stratum Total Sections Sections Counted 1 Cliffs over 10m 89 19 2 Agriculture 61 20 3 Not 1 or 2, peat 40 22 4 Not 1 or 2, non-peat 47 21 (a) Estimate the total number of otter dens in Shetland, along with a standard error for your estimate.
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here i help you for a and b , please neglect b if you don't need
a.) The estimated number of otter dens along the coastline is 985 and the standard error for the estimate is 73.92.
b.) So, best classification of sections depends on judgment of the researcher and this leads to selection bias.
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