Collecting Data
What statistical measurement describes how far apart the smallest and largest observations are?
What technique assigns subjects to treatment groups using a chance process?
In planning an observational study regarding sleep habits and academic performance, what is the best strategy for reducing variability within groups?
What do we use to describe the spread of values around the mean in a data set?
If a researcher uses a larger sample size when conducting a study, how does this generally affect the width of the resulting confidence interval for the population mean?
Which method involves selecting individuals such that each has an equal chance of being chosen?
When inferring a causal relationship from an observational study on the effect of exercise on stress levels, which of the following is a critical consideration to avoid incorrectly attributing correlation as causation?
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When conducting an observational study on dietary habits, why would scientists prefer stratified sampling over simple random sampling?
Which sampling method ensures that every individual in the population has an equal chance of being selected?
Why would researchers use block designs when conducting experiments comparing fertilizer effects on crop yields?