Mark$$ Gershon, owner of a musical instrument$$ distributorship, thinks that demand for guitars may be related to the number of television appearances by the popular group Maroon $5$ during the previous month. Gershon has collected the data shown in the following$$ table:

$$

Maroon $5$ TV Appearances

$4$

$4$

$8$

$7$

$9$

$5$

Demand for Guitars

$4$

$6$

$7$

$4$

$10$

$7$

This exercise contains only parts$$ b$,$ c$,$ and d$.$

Part $2$

$$b$)$ Using the$$ least$-$squares regression$$ method, the e the correlation coefficent $($r$)$ for this model $($round your answer to four