A Local Tire Dealer Wants to Predict the Number of Tires

question 138

Essay

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
-Find the rejection point for the t statistic at a = .05 and test H₀: ?₁? 0 vs.H_a: b₁> 0.

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Definitions:

Myelomeningocele

A type of spina bifida where the spinal canal and the backbone don't close before birth, resulting in damage to the spinal cord and nerves.

Hydrocephalus

A condition characterized by an abnormal accumulation of cerebrospinal fluid within the cavities of the brain, potentially causing increased pressure and swelling.

Craniostenosis

A condition characterized by the premature fusion of one or more sutures of an infant's skull, affecting skull and brain growth.

Myelomeningocele

A type of spina bifida where there is a hernia of the spinal cord and its meninges through a defect in the vertebral column.