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 that measure the presence, abundance, and health of the 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) Summary data for two river basins, Muskingum and Hocking are given in the accompanying table. River Basin Sample Size Mean Standard DeviatoinMuskingum 53 .035 1.046Hocking 51 .340 0.960a) Use a 90% confidence interval to compare the mean IBI values of the two river basins. Interpret the interval. b) Conduct a test of hypothesis (alpha=0.10) to compare the mean IBI vaues of the two river basins. Explainwhy the result will agree with the inference you derived from the 90% confidence interval in part a.

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

An annual marathon covers a route that has a distance of approximately 26 miles. winning times for this marathon are all over 2 hours. the following data are the minutes over 2 hours for the winning male runners over two periods of 20 years each. earlier period 14 12 15 22 13 10 19 13 9 14 20 18 16 20 23 12 18 17 6 13 recent period 7 11 7 14 8 9 11 14 8 7 9 8 7 9 9 9 9 8 10 8 (a) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the earlier period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks. for more details, view how to split a stem.) minutes beyond 2 hours earlier period 0 1 2 (b) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the recent period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks.) minutes beyond 2 hours recent period (c) compare the two distributions. how many times under 15 minutes are in each distribution

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)