Statistically the results will not be scientifically valid if the sample size is too small.
self selected
Random sampling techniques.
find a group to represent the universe
Find a group to represent the universe
A control group is needed to see how the sample responds under normal conditions
this is brief, but a census gathers data from the whole group/poulation, wheras a sample investigation on takes a small part of the group/poulation, a sample
The sample space is {m, a, t, h, e, i, c, s} which, curiously, is also the sample space for choosing a letter from my user name!
Every accident/incident is followed by investigation.
random sample or probability sample
self selected
It should reduce the sample error.
bias
If the sample is homogeneous, then half of its volume has half of its mass and half of its weight.
The sample space is {p, r, o, b, a, i, l, t, e, s}
Ignition initiated this fire. What initiated the investigation? Have you been initiated?
Sampling gives good insight of the choosen sample
Failure to provide a DNA sample in a criminal investigation can result in legal consequences such as being charged with obstruction of justice or contempt of court. This refusal may also lead to suspicion and potentially hinder the investigation, making it harder for law enforcement to identify and apprehend the perpetrator.