Question: We gathered 50 observations from a certain population and calculated a 95% confidence interval. If we had quadrupled the number of observations what would have

We gathered 50 observations from a certain population and calculated a 95% confidence
interval. If we had quadrupled the number of observations what would have been the
approximate effect on the width of our confidence interval?
(a) It would have been reduced by a factor of 8
(b) It would have been reduced by a factor of 4
(c) It would have been reduced by a factor of 2
(d) It would stay the same

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