UCI Classification and Data Analysis Discussion

I’m working on a data analytics question and need an explanation and answer to help me learn.

1. At first glance, it often seems that accuracy rate and error rate should be the most important metrics used to assess the quality of a classification model. However, when might another metric, such as sensitivity, precision, or specificity, be more important? You can use a real-life example or a fictional example to make the case here. You may want to use a confusion matrix as a visual aid.
2. Using a real-life example, describe an ethical challenge related to data mining. In your post, be sure to explain why the issue is multi-sided before explaining your personal stance on the issue.
3. Find a dataset that has a variable that contains dates, and read it into your R environment. Using any package in R, convert the column that contains dates to the Date data type. Use the str() function to prove that the variable has been converted. Write a few sentences that explain why formatting dates can be troublesome.