[Step-by-Step] A random sample of 21 nickels measured with a very accurate micrometer showed a mean diameter of 0.834343 inches with a standard deviation
Question: A random sample of 21 nickels measured with a very accurate micrometer showed a mean diameter of 0.834343 inches with a standard deviation of 0.001886 inches.
- Why would nickel diameters vary?
- Construct a 99 percent confidence interval for the true mean diameter of a nickel.
- Discuss any assumptions that are needed.
- What sample size would ensure an error of ± 0.0005 inches
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