Leslie Sporting Goods is a locally owned store that specializes in printing team jerseys. The majority of its business comes from orders for various local teams and organizations. While Leslie$$s prints everything from bowling team jerseys to fraternity$/$sorority apparel to special event shirts, summer league baseball and softball team jerseys are the company$$s biggest source of revenue.

A portion of Leslie$$s operating information for the company$$s last year follows:

Number of Operating

Month Jerseys Printed Cost

January $220$ $$5,875$

February $2155,780$

March $2455,950$

April $5558,700$

May $7009,700$

June $6159,295$

July $4606,220$

August $3506,150$

September $3206,040$

October $2505,960$

November $2054,925$

December $2004,810$

Required:

$3.$ Using the high$-$low method, calculate the store$$s total fixed operating costs and variable operating cost per jersey.

$4.$ Using the high$-$low method results, calculate the store$$s expected operating cost if it printed $475$ jerseys.

$5.$ Perform a least$-$squares regression analysis on Leslie$$s data.

$6.$ Using the regression output, create a linear equation $($y $=$ a $+$ bx$)$ for estimating Leslie$$s operating costs.

$7.$ Using the least$-$squares regression results, calculate the store$$s expected operating cost if it prints $630$ jerseys.