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Collecting data crossword

Horizontales
used to provide baseline data for comparison
what/who the treatment is being imposed on
a type of probability sampling in which the researcher randomly selects a subset of participants from a population.
helps explain/predict response
a pattern of inaccurate results
Verticales
when some members of a population cannot or are less likely to be included in a sample
when an individual is part of a sample but chooses not to respond or they canot be reached
subjects are paired and then randomly assigned to a treatment
splits population into groups based on location
group of experimental units that are similar