Normal Distribution

What is the total area under the curve of a standard normal curve?

• 0

• 1

• -1

• cannot be determined

Which of the following is the symbol for sample size?

• r

• n

• σ

• X

Which of the following is the symbol for population size?

• r

• n

• σ

• X

Which of the following is the symbol for population standard deviation?

• r

• n

• σ

• X

What is the required area as depicted by the shaded region of the given figure?

• At least z

• Less than -z

• Greater than z

• To the right of -z

What is the correct step in getting the area between z = -1 and z = 1?

• Add the area of z = -1 and z = 1.

• Get the difference between the areas of z = 0 and z = 1.

• Multiply the area of z = 1 to itself.

• Subtract the area of z = -1 and z = 1.

What is the area of the shaded region in the given figure if z = 1?

• 0.1587

• 0.3413

• 0.5000

• 0.8413

What does it mean to have a z-score of z = 0  on a quiz?

• It means your score is below average.

• It means you earned a zero on the quiz.

• It means you scored the same grade as the average grade.

• It means your score is above average.

What does it mean to have a z-score of z > 0  on a quiz?

• It means your score is below average.

• It means you earned a zero on the quiz.

• It means you scored the same grade as the average grade.

• It means your score is above average.

What does it mean to have a z-score of z < 0  on a quiz?

• It means your score is below average.

• It means you earned a zero on the quiz.

• It means you scored the same grade as the average grade.

• It means your score is above average.