Biologists want to estimate the number of deer living in a certain region. They will use a method known as a hair snare. A hair snare is a length of barbed wire set up near a salt lick, where deer can lick minerals and nutrients from salt deposits. The wire snares hair from the neck of the deer. The hair is collected and sent for analysis. The biologists will randomly place 90 salt licks throughout the region. The region consists of 3 areas: the town, the forest, and the lake, as shown in the following diagram
(a) Two methods have been proposed for choosing where to place the salt licks: a simple random sample or a stratified random sample, with the area as strata. Give one reason why the stratified might be the better method for choosing where to place the salt licks.

Sampling is a method that implies randomly selecting participants, places, etc. as part of an experiment. There are two main methods for sampling:

Simple random sampling: This will mean choosing randomly the places to place the salt licks.
Stratified random sampling: This means dividing the total area into subareas and then choosing random spots to place the salt licks.

The second method is the best to use because this will guarantee in each subarea there is the same number of salt licks. Preventing many salts licks to be together or a subarea to not having any salt licks.

Based on this, we can conclude this method will lead to more accurate results.

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