7.42 Index of Biotic Integrity. The Ohio Environmental Protection Agency used the Index of Biotic Integrity (IBI) to measure the biological condition or health of an aquatic region. The IBI is the sum of metrics which measure the presence, abundance, and health of fish in the region. (Higher values of the IBI correspond to healthier fish populations.) Researchers collected IBI measurements for sites located in different Ohio river basins. (Journal of Agricultural, Biological, and Environmental Sciences, June 2005.) 1mA - mB) 1mB - mC) 1yA - yB2 1yB - yC2 yA yB yC Summary data for two river basins, Muskingum and Hocking, are given in the table. Use a 90% confidence interval to compare the mean IBI values of the two river basins. Standard River Basin Sample Size Mean Deviation Muskingum 53 .035 1.046 Hocking 51 .340 .960

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.

shift 4 units up, and 1 unit left.

it will translate f(x) = 3^x to g(x) = 3^(x+1) + 4

c) yes, because of asa or aas