A Report Noted That for the Population of 9th Graders

question 7

Multiple Choice

A report noted that for the population of 9th graders, one?third of the students are unable to pass a quiz in basic geography.One teacher, having spent a great deal of time on geography instruction, gave the same quiz to a group of n = 72.Only X = 18 students in the group did not pass the test.The teacher would like to know if the number of students in this class who failed the quiz is significantly different from the general population.For this test, what is the z-score corresponding to X = 18?

• A)z = -0.375
• B)z = -1.00
• C)z = -1.50
• D)z = -2.00

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Definitions:

Four-Firm Concentration Ratio

An economic metric that assesses the market power of the four largest firms in an industry, expressed as a percentage of total market sales.

Pure Competition

A market structure characterized by a large number of small firms selling identical products, with no single seller having a significant influence on market price.

Oligopoly

A market structure characterized by a small number of large firms dominating the market, leading to limited competition.

Mutually Cancelling Advertising

Mutually cancelling advertising refers to a situation where the competitive advertising efforts of firms negate each other's impact, leading to no significant change in market share.