The standard error used in calculating a 95% confidence interval for the difference in the average sediment ammonium concentrations between Corpus Christi Bay area and the Lower Laguna Madre area is 9.61 and the margin of error is 18.84. What is the value of the Lower Confidence Limit (LCL)? Round to the 100ths place.

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Confidence Interval for the Difference in Two Population Means
The seagrass Thalassia testudinum is an integral part of the Texas coastal
ecosystem. Essential to the growth of T. testudinum is ammonium. Researchers
K. Lee and K. Dunton of the Marine Science Institute of the University of Texas
at Austin noticed that the seagrass beds in Corpus Christi Bay were taller and
thicker than those in Lower Laguna Madre. They compared the sediment
ammonium concentrations in the two locations and published their findings in
Marine Ecology Progress Series (Vol. 196, pp. 39-48). Following are the
summary statistics on sediment ammonium concentrations, in micromoles,
obtained by the researchers.
Corpus Christi Bay: xbar1 = 121, s1= 80, n1=70
Lower Laguna Madre: xbar2 = 34, s2 = 7, n2 = 50
%3D
The standard error used in calculating a 95% confidence interval for the
difference in the average sediment ammonium concentrations between Corpus
Christi Bay area and the Lower Laguna Madre area is 9.61 and the margin of
error is 18.84.
What is the value of the Lower Confidence Limit (LCL)? Round to the 100ths
place.
What is the value of the Upper Confidence Limit (UCL)? Round to the 100ths
place.
Transcribed Image Text:Confidence Interval for the Difference in Two Population Means The seagrass Thalassia testudinum is an integral part of the Texas coastal ecosystem. Essential to the growth of T. testudinum is ammonium. Researchers K. Lee and K. Dunton of the Marine Science Institute of the University of Texas at Austin noticed that the seagrass beds in Corpus Christi Bay were taller and thicker than those in Lower Laguna Madre. They compared the sediment ammonium concentrations in the two locations and published their findings in Marine Ecology Progress Series (Vol. 196, pp. 39-48). Following are the summary statistics on sediment ammonium concentrations, in micromoles, obtained by the researchers. Corpus Christi Bay: xbar1 = 121, s1= 80, n1=70 Lower Laguna Madre: xbar2 = 34, s2 = 7, n2 = 50 %3D The standard error used in calculating a 95% confidence interval for the difference in the average sediment ammonium concentrations between Corpus Christi Bay area and the Lower Laguna Madre area is 9.61 and the margin of error is 18.84. What is the value of the Lower Confidence Limit (LCL)? Round to the 100ths place. What is the value of the Upper Confidence Limit (UCL)? Round to the 100ths place.
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