Continuation
This exercise is a continuation of this data wrangling exercise and, thus, depends on data frames constructed there. Please load/run your script from that exercise to access the Bluegill only data frames.
Basic Analysis I
Further prepare the Bluegill only data frame for computation of relative weights by adding a relative weight variable and reducing the data frame to only fish with lengths for which a standard weight should be computed.
- For Bluegills captured only in 2007 …
- Compute the number of observations and mean, standard deviation, and standard error of relative weight for each Gabelhouse length category.
- Determine if the mean relative weight differs among Gabelhouse length categories.
- Construct a plot, with confidence intervals and appropriate significance letters, that depict your results.
Basic Analysis II
- Repeat the previous question for Bluegills captured only in 2008.
- Empirically compare your results between years. Provide at least three observations from your findings and at least two plausible explanations for what you observed.
Solution Code:
Available upon request to students not in a class. Contact fishR maintainers.