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The Five Step Hypothesis: Reducing Wait Time

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At Kelsey High School, Mrs. Oâ??brien noted that the students were waiting too long in line for their lunches. After collecting some data, Ms. Oâ??brien determined the mean wait time was 10 minutes. She felt this time period was excessive and she instituted new procedures to streamline the process. One month later, a sample of 100 students was selected. The mean wait time recorded was 5.9 minutes and the standard deviation of the sampling was ???? minutes. Using the .02 level of significance, conduct a five-step hypothesis testing procedure to determine if the new processes significantly reduced the wait time.

I need help figuring out the standard deviation and working out the problem with a five step process.

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The five step hypothesis test for reducing wait time is examined. A complete, neat and step-by-step solution is provided in the attached file.

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