Question

The mean alkalinity level of water specimens collected from the Han River in Seoul, Korea, is 50 milligrams per liter. (Environmental Science & Engineering, September 1, 2000.) Consider a random sample of 100 water specimens collected from a tributary of the Han River. Suppose the mean and standard deviation of the alkalinity levels for the sample are sample mean = 67.8 mg/L and s = 14.4 mg/L. Is there sufficient evidence to indicate that the population mean alkalinity level of water in the tributary exceeds 50 mg/L?

Use significance level 0.05

a. State the null and alternate hypothesis

b. Calculate the test statistic

c. Calculate the p-value

d. Write your conclusion

Answer 1