Lobster are caught in traps, which are baited and left in the open ocean. Licences to fish for lobster are limited, there is a small additional fee for each trap in use, and there are limits on the numbers of traps that can be placed in each of seven fishing zones. But those limits have changed over time. Here’s a scatterplot of the number of traps per licensed lobster fisher over time:

a) Does this plot satisfy the regression assumptions and conditions? Explain. A regression of Traps/Fisher vs. Year yields the following plot of residuals:

b) What can you see in the plots of residuals that may not have been clear in the original scatterplot of the data?

Transcribed Image Text:

500 375 + 250 125 అగ 1950 1975 2000 Year Traps/Fisher 40 30 80 -30 1950.0 1962.5 1975.0 1987.5 2000.0 Year Residuas