Question

Question 40 10 pts A petrochemical plant was built by a river. To verify whether the plant was contributing to pollution of the river water with benzo(a)pyrene, two sets of data were obtained by analyzing water samples from upstream (mean conc. - 0.95 ppb;n=5,5=0.05 ppb) and downstream (mean conc. - 1.10 ppb; n-6, s=0.08 ppb) with respect to the plant. Based on this data, one would reach this conclusion at 95% confidence level as to whether the plant is making significant contribution to the benzo(a)pyrene pollution of the river water. The contribution is significant The contribution is not More date is needed to reach a conclusion None of the above

Answer 1

This question has mean, s and value given

whereas formula of confidence interval seeks for standard deviation as well.

Also, it requires the base to data to compare with so that one can reach to conclusion that whether this is fit or not.

Thus for the given data it is not possible to deduce, but with further standard deviation and standard value of itnerval we can surely conclude