Erroneous sample identification and mistaken sample handling can stay hidden for many years compromising results; this problem has plagued researchers that work with cell culture for years [ 6, 7].
It causes a mistaken A parameter.
People make mistakes' (Sample 2014, 32).
People make mistakes' ((Sample I 2014), 32).
If you make a mistake in a sample, you have to unpick it and do it again.
[laughter] We just made a classic and dangerous mistake, a mistake known as sampling bias.
Second, it would be a mistake to confuse large sample size with greater accuracy (even when the sample is randomly selected) as other types of error---including question wording and non-response biases--may also influence the results.
A scientist researching ebola at a federal lab in Atlanta may have been exposed to the deadly virus after a mistake in handling a sample, the Centers for Disease Control and Prevention announced on Wednesday.
Due to a logistical mistake, stem samples were not harvested in September and October before the start of the warming treatment.
The department said yesterday that failing to take a sample was a mistake and that it would investigate.
