Question

This year’s water pollution readings at State Park 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 3.6 3.6 3.7 3.9 3.8 3.7 4.0 3.7 3.5 3.8 3.6 3.5 3.6 3.5 3.7 3.6 3.9 3.9 3.7 3.6 3.5 Researchers 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. If the p-value is less than 0.0001, what is your decision (let α = 0.05) ?

Retain Ho

Reject Ho

Answer 1

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