Normal Distribution and Z Score

The area on the z table associated with one standard deviation above the mean is

• .3413

• .6826

• .0000

• .9515

A negative z score is located

• Below the mean

• At the mean

• Above the mean

A positive z score is located

• At the mean

• Above the mean

• Below the mean

The value of the mean and standard deviation of a standard normal distribution is __ and __ respectively.

• 0 and 1

• 1 and 0

The wider the width of the normal curve, the

• higher its peak

• larger its sd

• lower its peak

• smaller its sd

What is the area for the left side of the curve from the mean?

• 1

• 0.75

• 0.5

• 0.25

How many standard scores is 14 located if a set of scores is normally distributed with a mean of 12 and a standard deviation of 0.5?

• 2 standard scores to the left

• 2 standard scores to the right

• 4 standard scores to the left

• 4 standard scores to theright

μ = 70 , σ = 8 , X = 50 . Find z score

• 2.5

• -2.5

• 5.2

• -5.2

This data is normally distributed.  What percent of the data is in the shaded region?

• 68%

• 95%

• 99.7%

• 50%