A manufacturing firm would like to compare its monthly revenues and costs for the previous year. The following table shows the revenues and costs for the company in each month of the previous year. Of particular interest to the company is how the company$$s revenues and costs perform during the summer months because that is when the company$$s sales tend to be highest.

Month Revenues $($in $$1,000$s$)$ Costs $($in $$1,000$s$)$

Jan $1,1211,007$

Feb $9971,002$

Mar $1,1511,010$

Apr $1,2021,085$

May $1,4221,287$

Jun $1,8771,488$

Jul $1,9111,621$

Aug $1,9881,625$

Sep $1,5211,617$

Oct $1,2881,178$

Nov $1,1001,008$

Dec $1,022987$