To study fairness of IRS audits in a recent year, a researcher recorded for 20 US cities the percentage of individual or joint taxpayers audited along with the city's median household Income (in $1000).A scatterplot of the data with the least squares regression line is shown below.Below that are some basic descriptive statistics for the variables.Questions 3 - 6 concern this data and this regression. Along with noting the correct answer choice, briefly explain all answers.