Twenty-Five Psychology Instructors Have Formed a Committee to Pick Next

question 140

Short Answer

Twenty-five psychology instructors have formed a committee to pick next year's textbook, and they have narrowed their decision down to two equally good books, one with a better bibliography and references, and the other with a better format and illustrations. Since the books are considered to be equally good, we will assume the probability an instructor chooses either book is 0.5 and the instructors' decisions are made independently.
Using the binomial distribution, find the probability 15 or more instructors choose the book with the better format and illustrations.
______________
Use the normal approximation to the binomial to find the probability 15 or more instructors choose the book with the better format and illustrations.
______________
Compare the results in parts (a) and (b). Is the normal approximation a good approximation?
______________

---

Definitions:

Structural Protein

Proteins that play a role in building and maintaining the shape and structure of cells and tissues, such as collagen in connective tissues.

Extracellular Matrix

A complex network of proteins and carbohydrates outside cells, providing structural and biochemical support to surrounding cells.

Collagen

A primary structural protein found in skin and connective tissue, responsible for skin elasticity and strength.

Derived Characteristic

A trait that is present in an organism but was absent in the last common ancestor of the group to which the organism belongs.