The Manufacturer of Beanie Baby Dolls Used Quarterly Price Data $P _ { t } = a + b t + c _ { 1 } D 1 _ { t } + c _ { 2 } D 2 _ { t } + c _ { 3 } D 3 _ { t }$

question 4

Multiple Choice

The manufacturer of Beanie Baby dolls used quarterly price data for 2012I - 2020IV (t = 1,...,36) and the regression equation $P _ { t } = a + b t + c _ { 1 } D 1 _ { t } + c _ { 2 } D 2 _ { t } + c _ { 3 } D 3 _ { t }$ to forecast doll prices in the year 2021. $P _ { t }$ is the quarterly price of dolls,and $D 1 _ { t } , D 2 _ { t }$ and $D 3 _ { t }$ are dummy variables for quarters I,II,and III,respectively. At the 2 percent level of statistical significance,is there a statistically significant trend in the price of dolls?

• A)Yes,because 0.0022 < 0.02.
• B)No,because 0.0022 > 0.02.
• C)Yes,because 0.800 > 0.02.
• D)Yes,because 0.240 > 0.02.
• E)Yes,because 3.33 > 0.02.

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Definitions:

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The concentration of epinephrine, a hormone and neurotransmitter also known as adrenaline, significant for the body's fight-or-flight response.

NK Cell Count

The quantity of natural killer cells, a type of white blood cell that plays a crucial role in the body’s immune response by attacking virus-infected cells and tumors.

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The concentration of cortisol, a stress hormone produced by the adrenal glands, which can indicate an individual's response to stress.

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A type of white blood cell that plays a significant role in the body's immune system, fighting infections and diseases.