A Local Tire Dealer Wants to Predict the Number of Tires

question 103

Multiple Choice

A local tire dealer wants to predict the number of tires sold each month.He believes that the number of tires sold is a linear function of the amount of money invested in advertising.He 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. = 24 = 124 = 42 = 338 = 196 Calculate the sample correlation coefficient.

• A).7977
• B).6364
• C).3780
• D).1428

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Definitions:

Half-Wave Rectification

A process that converts alternating current (AC) to direct current (DC) by allowing only one half of the AC cycle to pass through.

AC Circuit

Pertains to an electrical circuit in which the current changes direction periodically, as opposed to a DC (Direct Current) circuit where current flows in one direction only.

Reverse Bias

A condition in semiconductor devices where the voltage is applied in the opposite direction of the forward bias, often to block current flow.

Initial Cost

The initial expenditure involved in starting a project, acquiring an asset, or initiating an investment.