Use the Following Information for Questions
Observation
$\chi$ ² with 8 Degrees of Freedom

question 2

Multiple Choice

Use the following information for questions
Observation

The numbers in each cell represent the sales level in thousands of
dollars.
-Which of the following is/are true? 1-The appropriate null hypothesis would state, "Advertising levels have no effect on sales." 2-The appropriate null hypothesis would state, "There is an increase in the sales level due to an increase in the intensity of the advertising effort." 3-The appropriate statistic to test the null hypothesis would be $\chi$ ² with 8 degrees of freedom.

• A)1
• B)2
• C)3
• D)1 and 3
• E)2 and 3

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Definitions:

IR Spectroscopy

A technique used to identify molecular structures through the absorption of infrared light, which causes molecular vibrations.

Compounds

Substances formed from the chemical combination of two or more elements, characterized by specific molecular compositions and properties.

C=O Stretch

A vibrational mode in infrared spectroscopy, indicating the presence of a carbonyl group (\(C=O\)) in the molecule, characterized by a strong, distinctive absorption band.

Aldehydes

Organic compounds characterized by the carbonyl group bonded to at least one hydrogen atom.