Complete the following tasks to explore whether age is related to marijuana use in

the United States.

$1)$ Open nhanes$\_2013\_$ch$1.$csv$.$

$2)$ Examine the data types for DUQ$200,$ RIDAGEYR, and RIAGENDR,

and fix data types if needed.

$3)$ Code missing values appropriately for DUQ$200,$ RIDAGEYR, and

RIAGENDR

$4)$ Create a bar chart showing the percentage of NHANES participants

answering yes and no to marijuana use.

$5)$ Recode age into a new variable called age.cat with $4$ categories:

$1829,3039,4049,5059$

$6)$ Create a bar chart of marijuana use by age group

$7)$ Add a prolog and comments to your code

$8)$ Following the R code in your code file, use comments to describe

what you found. Given what you found and the information in the

chapter, what do you predict will happen with marijuana legalization

in the next $10$ years? Discuss how the omission of older people from

the marijuana use question for NHANES influenced your

prediction. Write your prediction and discussion in comments at the

end of your code file.