Exhibit 9-4 A Random Sample of 16 Students Selected from the Student

question 116

Multiple Choice

Exhibit 9-4
A random sample of 16 students selected from the student body of a large university had an average age of 25 years. We want to determine if the average age of all the students at the university is significantly different from 24. Assume the distribution of the population of ages is normal with a standard deviation of 2 years.
-Refer to Exhibit 9-4. At a .05 level of significance, it can be concluded that the mean age is

• A)not significantly different from 24
• B)significantly different from 24
• C)significantly less than 24
• D)significantly less than 25

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Definitions:

Hydrogen Bonds

Weak bonds that form between a hydrogen atom in one molecule and a more electronegative atom, such as oxygen or nitrogen, in another, playing critical roles in the structure of DNA and proteins.

Ionic Bonds

Ionic bonds are chemical bonds formed between two atoms when one atom transfers electrons to another, resulting in oppositely charged ions that attract each other.

Covalent Bonds

Covalent bonds are chemical bonds where atoms share pairs of electrons, enabling each atom to attain a stable electron configuration.

Outermost Shell

In chemistry, refers to the valence shell, which is the outermost shell of electrons in an atom and determines an element's chemical properties.