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