In the Past,of All the Students Enrolled in "Basic Business

question 79

Essay

In the past,of all the students enrolled in "Basic Business Statistics," 10 percent earned A's,20 percent earned B's,30 percent earned C's,20 percent earned D's,and the rest either failed or withdrew from the course.Dr.Johnson is a new professor teaching "Basic Business Statistics" for the first time this semester.At the conclusion of the semester,in Dr.Johnson's class of 60 students,there were 10 A's,20 B's,20 C's,5 D's,and 5 W's or F's.Assume that Dr.Johnson's class constitutes a random sample.Dr.Johnson wants to know if there is sufficient evidence to conclude that the grade distribution of his class is different from the historical grade distribution.Calculate the expected values for A's and D's.

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Definitions:

Recall

The mental process of retrieving information from the past, which can vary in ease depending on several factors like recency and relevance.

Declarative Memories

Memories that can be consciously recalled, such as facts and events, and expressed verbally.

Anterograde Amnesia

A loss of the ability to create new memories after the event that caused the amnesia, leading to a partial or total inability to recall the recent past.

Iconic Memory

A component of the visual memory system which includes a very brief (<1 second) recall of visual images.