2015’s water pollution readings at Huntington Beach seem to be lower than last year. A sample of 30 readings was randomly selected from this year’s da

2015’s water pollution readings at Huntington Beach seem to be lower than last year. A sample of 30 readings was randomly selected from this year’s daily readings:3.6    3.9    3.3    3.4    3.8    3.7    3.5    3.6    3.7    3.63.6    3.7    3.9    3.8    3.7    4.0    3.7    3.5    3.8    3.63.5    3.6    3.5    3.7    3.6    3.9    3.9    3.7    3.6    3.5Researchers want to know if this is sufficient evidence to conclude that the mean of this year’s pollution readings is significantly lower than last year’s mean of 3.8.A)C)

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