Lifetimes of Wristwatches A random sample of the lifetimes of 23 inexpensive wristwatches has a standard deviation of 3.9 months. Assume the variable is normally distributed. Use the chi-square...



Lifetimes of Wristwatches
A random sample of the lifetimes of 23  inexpensive wristwatches has a standard deviation of 3.9  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 90%  confidence intervals for the variance and standard deviation.














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Do you feel that the lifetimes are relatively consistent?










▼(Choose one)














Jun 03, 2022
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