3. In the 24 months from January 2016 through December 2017, the variance of the monthly...

3. In the 24 months from January 2016 through December 2017, the variance of the monthly percent changes in the 1000 elements of an unweighted price index was 0.24. In 2018, the variance of the 12 months of data was 0.32. How do you ascertain whether the standard deviation has changed since 2017? Has it (assume a 95% level of confidence)?

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orchestra answered 1 year ago

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