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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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Your Turn

1. Construct a 97 percent confidence interval around a sample mean of 31.3 taken from a population that is not normally distributed with a standard deviation of 7.6 using a sample of size 40.
2. What sample size would be necessary to ensure a margin of error of 5 for a 98 percent confidence interval taken from a population that is not normal, which has a population standard deviation of 15?
3. Construct a 90 percent confidence interval around a sample mean of 16.3 taken from a population that is not normally distributed with a population standard deviation of 1.8 using a sample of size 10.
4. The following sample of size 30 was taken from a population that is not normally distributed:
Construct a 90 percent confidence interval ...

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