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Question1: The department of natural resources defines a fish to be unsafe to eat if the polychlorinated biphenol (PCB) concentration exceeds 5 parts per billion (ppb). A random sample of 10 fish taken a local lake resulted in the data below:

2.6, 6.6, 4.8, 5.4, 5.1, 4.5, 6.9, 4.9, 3.7, 3.8

At the 0.05 significance level, is there sufficient evidence to conclude that the mean PCB concentration for fish this lake exceeds five ppb?

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