A Local Tire Dealer Wants to Predict the Number of Tires

question 174

Multiple Choice

A local tire dealer wants to predict the number of tires sold each month. The dealer believes that the number of tires sold is a linear function of the amount of money invested in advertising. The dealer randomly selects 6 months of data consisting of tire sales (in thousands of tires) and advertising expenditures (in thousands of dollars) . Based on the data set with 6 observations, the simple linear regression model yielded the following results.
$$\sum x$$ = 24 $$\sum X ^ { 2 }$$ =124 $$\sum Y$$ =42 $$\sum Y ^ { 2 }$$ =338 $$\sum X Y$$ =196
-What is the degrees of freedom value associated with the error sum of squares,or unexplained variation?

• A)1
• B)2
• C)3
• D)4
• E)5

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Definitions:

Vitiligo

A skin condition characterized by patches of skin losing their pigment, resulting in irregular white spots.

Miliaria

A skin condition, often referred to as heat rash, characterized by small, itchy bumps caused by blocked sweat ducts during hot and humid conditions.

Impetigo

A highly contagious bacterial skin infection, characterized by red sores, blistering, and a honey-colored crust.

Streptococcus

A genus of coccus (spherical) bacteria, many of which are responsible for diseases in humans and animals.