A 90% confidence interval for the mean m of a population is computed from a random sample
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A 90% confidence interval for the mean m of a population is computed from a random sample and is found to be 9 ± 3. Which of the following could be the 95% confidence interval based on the same data?
(a) 9 ± 2
(b) 9 ± 3
(c) 9 ± 4
(d) 9 ± 8
(e) Without knowing the sample size, any of the above answers could be the 95% confidence interval.
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