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Q5) Find the 90% confidence interval for the variance and standard deviation for the lifetimes of inexpensive wrist watches if a sample of 24 watches

Q5) Find the 90% confidence interval for the variance and standard deviation for the lifetimes of inexpensive wrist watches if a sample of 24 watches has a standard deviation of 4.8 months. Assume the variable is normally distributed. Do you feel that the lifetimes are relatively consistent?

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