Standard Normal Probabilities

The area under a standard normal curve to the right of a particular z-value is 0.05. Which of the following describes the z-value?

• Barely positive

• Barely negative

• Zero

• Significantly positive

• Significantly negative

The area under a standard normal curve to the right of a particular z-value is 0.95. Which of the following describes the z-value?

• Barely positive

• Barely negative

• Zero

• Significantly positive

• Significantly negative

The area under a standard normal curve to the right of a particular z-value is 0.52. Which of the following describes the z-value?

• Barely positive

• Barely negative

• Zero

• Significantly positive

• Significantly negative

The area under a standard normal curve to the left of a particular z-value is 0.53. Which of the following describes the z-value?

• Barely positive

• Barely negative

• Zero

• Significantly positive

• Significantly negative

What percent of a normal distribution lies outside of ±3 standard deviations?

• 99.7%

• .15%

• .3%

• 100%

What is the the total area under the standard normal distribution curve?

• 100

• 99.7%

• 0.5

• 1.00

If the value we are looking for is smaller than the mean, the value of z is:

• Not enough information

• Negative

• Positive

• 0

What percent of a normal distribution lies outside of ±2 standard deviations?

• 99.7%

• 95%

• .3%

• 5%

What percent of a normal distribution lies outside of ±1 standard deviations?

• 68%

• 95%

• 34%

• 5%

If the value we are looking for is larger than the mean, the value of z is:

• Not enough information

• Negative

• Positive

• 0