Food Inspectors Need to Estimate the Level of Contaminants in Food

Food inspectors need to estimate the level of contaminants in food products packaged at a certain
Factory. Initial tests were based on a small sample but now the inspectors double the sample size for
A follow-up test. The main purpose of the larger sample is to…

A) reduce non-response bias.
B) decrease the variability in the population.
C) decrease the standard deviation of the sampling model.
D) reduce confounding due to other variables.
E) reduce response bias.