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Average time and standard deviation

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Reference no: EM132152083

A task is known to have an average time of 20 seconds and a standard deviation of 3.25 seconds. The task process has been re-structured, and it is hoped that the average time and standard deviation will both have decreased. I created 32 sample observations of the restructured process in this data sheet -

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  1. I want to know the statistical test to see if the standard deviation has been reduced. What is the null hypothesis and which tail or tails (not sure if it's 2 tailed test) contains the rejection region?
  2. What is the critical value defining the rejection region?
  3. What is the test statistic?
  4. What is the conclusion about the null hypothesis? (Use 95% confidence interval)

Reference no: EM132152083

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