a$)$ Create a dataframe in R called cars that contains the information above. Print it in your RStudio and check its naming matches the naming above. You do not need to state an answer $($other than code$)$ for this question. $[1$ mark$]$

b$)$ Fit a simple linear regression with speed as the predictor and distance as the outcome. What are the slope and intercept coefficients? $[1$ mark$]$

c$)$ Provide a $90$ percent confidence interval for the slope coefficient of the regression. $[1$ mark$]$