Using the NFL$\_$HW$5$ data set, answer the following questions:

a$.$ Create a column in the data set named Playtime that contains the following

information:

If the player played:

$0$ years: "Rookie"

$1$ to $4$ years: $"1-4$ years"

$5$ to $8$ years: $"5-8$ years"

$9$ to $12$ years: $"9-12$ years"

$13$ or more years: $"13+$ years"

Hint: Remember that you are writing logical expressions that syphon off the next

set of individuals. For example, if you start with Rookie, when you write your

logical expression for the next category, you only need to worry about the players

who played $4$ years or less.

b$.$ Use a function to ensure that Playt ime's levels are listed in the order listed

above.

A frequency table of Playt ime should result in:c$.$ Using the column Division, change the labels of the numbers to:

$1=$ AFC East

$2=$ AFC North

$3=$ AFC South

$4=$ AFC West

$5=$ NFC East

$6=$ NFC North

$7=$ NFC South

$8=$ NFC West

A frequency table of Division should result in:

$>$ table$($NFL$Division$)$

AFC East AFC North AFC South AFC West NFC East NFC North NFC South NFC West

$344$

$349$

$357$

$339$

$350$

$357$

$320$

$348$