Homework $1$: Due $2/2/22,11$:$59$pm

Instructions:

Place all work into a one$-$to$-$two page document. Upload the document onto the Canvas homework page by the due date. Documents must be typed and in one of the following formats: $.$doc, $.$docx, or $.$ pdf$.$ Data for completing these problems may be found under the "Files$/$Homework$/$Homework $1"$ page on Canvas.

Working with R: The file Fitness.csv contains information on $417$ individuals on how much they exercise $("$Exercise$"),$ their marital status $("$Married$"),$ and their annual income $("$Income$").$

$($a$)(1$pt$)$ Give the exercise status, the marital status, and the annual income for the $150$ th and the $350$th individual. Also provide the line or lines of $R$ code that allows you to access this information.

$($b$)(1$pt$)$ Find the marital status of the $20$th$,41$st$,$ and $311$th individual. Also provide the line or lines of $R$ code that allows you to access this information.

$($c$)(1$pt$)$ Find the annual income of the $185$th$,186$th$,187$th$,188$th$,$ and the $189$th individual. Also provide the line or lines of $R$ code that allows you to access this information.

$($d$)(1$pt$)$ Write two lines of code: one that changes the marital status of the $4$th observation to "Garlic Bread" and one that changes the annual income of the $6$th observation to $$25.$

$($e$)(1$pt$)$ Write a line of $R$ code that creates a vector named "cooldata" that contains the numbers $9,3,$ and $7,$ in that order.

$($f$)(1$pt$)$ Write the two sentences in the "Description" section of the R help file for the $sd()$ function.

Understanding $R$ input: A student writes the following line of $R$ code:

example $=c(8,6,-7,5,-30,9,3,-13)$

$($a$)(0\mathrm{.}5$ pts each$)$ Give the output of the following $R$ commands.

i$.$ example$[6]$

ii$.$ example$[-3]$

ii$.$ example $c(2,5,6)$

iv$.$ example$[3$:$5]$

v$.$ example $-c(1,6,7)$

$($b$)(0\mathrm{.}5$pts each$)$ Explain why each of the following commands will throw a warning or error.

i$.$ example $[9]$

ii$.$ Example$[3]$

iii. example $1,2,6,7$