A study reports a 95% confidence interval for a population mean. Which statements are correct?
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1
If the study were repeated many times, about 95% of the intervals built this way would contain the true mean.
2
There is a 95% probability that the true mean lies inside this particular interval.
3
A wider interval means the estimate is less precise.
4
About 95% of the sampled values fall inside the interval.
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