An electric company reported the annual number of kilowatt hours expended by various home appliances. It is claimed that a dishwasher expends an average of 46 kilowatt hours per year. If a random sample of 12 homes indicates that dishwashers expend an average of 42-kilowatt hours per year with a standard deviation of 11.9 kilowatt hours, does this suggest at a 0.05 significance level that dishwashers expend, on average, less than 46 kilowatt hours annually? Assume the population of kilowatt hours to be normal

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Collection Systems

The collection systems form a part of sanitary engineering, which is a sub-branch of civil engineering. It is also known as public health engineering and wastewater engineering. It is a methodology followed to remove and properly dispose of human waste, along with creating systems to provide safe and clean usable water. These measures ensure a hygienic and disease-free community. Sanitary engineering, apart from building sewer disposal units, is also involved in plumbing, fire protection, hydraulics, life safety, environmental protection, information technology, microbiology, pathology, and so on.