A 90% confidence interval for the mean of a population is computed from a random sample and is found to be 90 ± 30.
Which of the following be the 95% confidence interval based on the same data?
A) 90 ± 39
B) Without knowing the sample size, any of the above answers could be the 95% confidence interval.
C)90 ± 21
D)90 ± 70
E)90 ± 30
