Lifetimes of Wristwatches A random sample of the lifetimes of 30 inexpensive wristwatches has a standard deviation of 4.6 months. Assume the variable is normally distributed. Use the chi-square distribution table to find any chi-square values to three decimal places. Round your final answers to one decimal place. Find the 80% confidence intervals for the variance and standard deviation. ? < o2 < ? ? < o < ?

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Lifetimes of Wristwatches A random sample of the lifetimes of 30 inexpensive wristwatches has a standard deviation of 4.6 months. Assume the variable is normally distributed. Use the chi-square distribution table to find any chi-square values to three decimal places. Round your final answers to one decimal place.

Find the 80% confidence intervals for the variance and standard deviation.

? < o2 < ?

? < o < ?

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