Mathematics, 29.01.2021 16:10 ashleyprescot05
Acid rain accumulations in lakes and streams in the northeastern part of the United States are a major environmental concern. A researcher wants to know what fraction of lakes contain hazardous pollution levels. He randomly selects 200 lakes and determines that 45 of the selected lakes have as unsafe concentration of acid rain pollution.
(a) Calculate the best point estimate of the population proportion of lakes that have unsafe concentrations of acid rain pollution.
(b) Determine a 95% confidence interval for the population proportion.
(c) If a local politician states that only 20% of the lakes are contaminated, does the study provide overwhelming evidence at the 95% level to contradict his views?
Answers: 2
Mathematics, 21.06.2019 15:00, rudolph34
Alake near the arctic circle is covered by a 222-meter-thick sheet of ice during the cold winter months. when spring arrives, the warm air gradually melts the ice, causing its thickness to decrease at a constant rate. after 333 weeks, the sheet is only 1.251.251, point, 25 meters thick. let s(t)s(t)s, left parenthesis, t, right parenthesis denote the ice sheet's thickness sss (measured in meters) as a function of time ttt (measured in weeks).
Answers: 1
Mathematics, 22.06.2019 00:30, amandapill
What is the area of the parallelogram? 48 sqrt(3)cm2 48 cm2 24 sqrt (3) cm2 24 cm2
Answers: 2
Acid rain accumulations in lakes and streams in the northeastern part of the United States are a maj...
Mathematics, 11.10.2019 01:00
Mathematics, 11.10.2019 01:00
Mathematics, 11.10.2019 01:00
Mathematics, 11.10.2019 01:00
Chemistry, 11.10.2019 01:00