Mathematics, 18.12.2021 01:00 pretti78
On November 1, 2001, EPA adopted new standards for arsenic in drinking water equal to a maximum 10 ppb. Every few months, an environmental engineer working with the Western UP Health Department collects samples from a local drinking water utility to see if the data demonstrate that the mean concentration of Arsenic exceeds the 10 ppb standard. Assume that sample values are normally distributed about the true mean. Suppose that the most recent set of 7 sample values yielded a sample average of 14.36 ppb and a sample standard deviation of 4.76 ppb.
A. Specify the appropriate null and alternative hypotheses to demonstrate that the mean concentration of arsenic exceeds the standard or 10 ppb.
B. What is the rejection region for a 1% test?
C. What do you conclude for this data set?
Answers: 3
Another question on Mathematics
Mathematics, 21.06.2019 20:20
Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.
Answers: 1
Mathematics, 21.06.2019 20:40
How is the equation of this circle written in standard form? x2 + y2 - 6x + 14y = 142 a) (x - 3)2 + (y + 7)2 = 200 b) (x+ 3)2 + (y - 7)2 = 200 (x - 6)2 + (y + 14)2 = 142 d) (x+6)2 + (y- 14)2 = 142
Answers: 1
Mathematics, 21.06.2019 21:50
Match each whole number with a rational, exponential expression 3 square root 27^2find the domain and range of the exponential function h(x)=125^x. explain your findings. as x decreases does h increase or decrease? explain. as x increases does h increase or decrease? explain.
Answers: 3
You know the right answer?
On November 1, 2001, EPA adopted new standards for arsenic in drinking water equal to a maximum 10 p...
Questions
Health, 20.09.2019 23:00
Chemistry, 20.09.2019 23:00
Physics, 20.09.2019 23:00
Biology, 20.09.2019 23:00
