SOLUTION: Eight chemical elements do not have isotopes (different forms of the same element having the same atomic number but different atomic weights). A random sample of 30 of the elements

Question 1161755: Eight chemical elements do not have isotopes (different forms of the same element having the same atomic number but different atomic weights). A random sample of 30 of the elements that do have isotopes showed a mean number of 19.63 isotopes per element, and the population has a standard deviation of 18.73. Estimate the true mean number of isotopes for all elements with isotopes with 90% confidence.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
half-interval is z*sigma/sqrt(n)=1.645 (for 90% CI)*18.73/sqrt(30)=5.63
that is added to and subtracted from the sample mean.
(14.00, 25.26)
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