The random variable, x is a water quality parameter, suspended solids with units of parts per million (ppm). A sample size of 60 yields a mean of 59.87 ppm, and a standard deviation of 12.5 ppm. Water quality criteria requires that the suspended solids do not exceed a mean, H, = 50 ppm. Test the hypotheses Ho: u = µ,vs. HA:µ > H. (right-tailed test) at a level of significance of 5 % and assume the pop variance is known.

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