Question

based on random samples of river heights, oceanographers estimate that 4,800 cubic kilometers (km³) of freshwater is discharged into the arctic ocean annually. the estimate has a margin of error of 240 km³ at the 90% confidence level. which of the following is the most reasonable claim about the volume of freshwater discharged annually into the arctic ocean? choose 1 answer: a it is between 4,800 and 5,040 km³. b it is between 4,560 and 5,040 km³. c it is between 240 and 4,800 km³. d it is between 240 and 4,320 km³.

Explanation:

Step1: Calculate the lower bound

The lower bound is the estimate minus the margin of error.
\(4800 - 240=4560\)

Step2: Calculate the upper bound

The upper bound is the estimate plus the margin of error.
\(4800 + 240 = 5040\)

Answer:

B. It is between \(4,560\) and \(5,040\ km^{3}\)