A government agency constructs a 95% confidence interval to estimate the mean amount of pollution in
a city's river. Assume that all conditions have been
met. The one-sample t-interval is (1.26. 3.91).
Water with 4.00 units of pollution or more, on
average, of this type of measure is said to be
contaminated. Is it reasonable to believe that this
city's river is contaminated?
O No. Because 4.00 is close to the upper bound of
the interval, it is reasonable to believe the river is
not contaminated.
O No. Because the interval representing the mean
amount of pollution is entirely below 4.00, it is
reasonable to believe the river is not
contaminated.
o Yes. Because 4.00 is close to the upper bound of
the interval, it is reasonable to believe the river is
contaminated
0 Yes. Because the interval representing the mean
amount of pollution is entirely below 4.00, it is
reasonable to believe the water is contaminated.