Thank you We studied the number of species of electric fish

Thank you!

We studied the number of species of electric fish living in the Amazon River to try to determine whether tributaries influence the diversity of species. We expected that there would be more species downstream of a tributary than upstream because tributaries bring sediments into the river, and electric fish are particularly adapted to the sort of cloudy, sediment-rich waters that a tributary might bring into the Amazon. We sampled the diversity of fish for 1 km upstream and downstream where 12 different tributaries entered the Amazon, The data are in the file fishdata.csy available on Moodle. Write a report (in full sentences, no point form) that addresses the following questions. Provide an Appendix made with RMarkdown to show the details of your analyses by providing both the R code and the output 1. Perform both a paired and an unpaired test to compare the number of species found upstream and downstream from the tributaries. Report the results, including a graph (with caption), and explain what you would conclude from the results of each test. Make sure you test the assumptions of each test 2. Since we expect more species downstream than upstream based on what we know about the preferred habitats of these fish, perform a one-tailed test and write a sentence or two describing your results in a way that you might report this result in a scientific paper. 3. Provide a detailed interpretation of the results form (2), that explains as clearly as possible what this analysis tells you, and what further study you might suggest and why. Write this interpretation in a way that would be understandable to the researchers who do not really know much about statistics, so that they will not misinterpret the statistics 4. Explain why the results of the analysis in (2) might be unreliable and how you would redo the study to be certain that your conclusions are valid

Solution

All the work is good

But, You have to conduct one more test before verify the \"Test for difference of means\", that is \"Test for difference of variances\".

If Test for difference of variances will give two population variances are equal then

t.test(fish$$speciesUptream,fishdata$speciesUpstream,var.equal=T,conf.level=0.05)

If Test for difference of variances will give two population variances are not equal then

t.test(fish$$speciesUptream,fishdata$speciesUpstream,var.equal=F,conf.level=0.05)