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# Sales from a chain of computer stores are normally distributed, with an average monthly sales volume ...

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Sales from a chain of computer stores are normally distributed, with an average monthly sales volume of $280,560. Estimating the amount of monthly variability in sales is of interest to help anticipate normal income fluctuations. A random sample of 8 months’ sales data yields a standard deviation of$10,423. What is a 98% confidence interval for the standard deviation of monthly sales volume?

($172,694.71,$666,866.84)

($6152.47,$21,491.21)

($6123.96,$27,725.40)

($6415.73,$24,774.57)

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## Introductory Statistics: A Problem-Solving Approach

Edition: 3rd
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apinaapina
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