Exercise: Normality Test
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1. Question
Data File: Normality.MTW
Situation:An economist wants to determine whether the monthly energy cost for families has changed from the previous year when the mean cost per month was $200. The economist randomly samples 25 families and records their energy costs for the current year. Before conducting any statistical comparison tests, the economist should first determine if the data are normal. Use the “Normality.MTW” data file to determine if the data are normally distributed.
Question:
Is the monthly energy cost data normally distributed?
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