Discussion
Which of the following factors does not usually affect the width of a confidence interval ?
Answer: C
The factor that does not usually affect the width is population size.
The width of a confidence interval for a mean depends on the confidence level desired (through the critical value), the variability in the population (the standard deviation), and the sample size (through the standard error, which shrinks as the sample grows).
Population size matters only when the sample is a large fraction of a finite population, through the finite population correction, so it does not usually affect the width.
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