STATS - REVIEW

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

• 100
• 25
• .5
• 1

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

• 2.5
• -2.5
• 5.2
• -5.2

The z-score represents.....

• the amount of standard deviations a data value is above or below the mean.
• the percentile the data value is above or below the mean.
• the amount of standard deviations a data value is above or below the median.
• the percent the data value is above or below the mean.

Which is NOT true about the standard normal distribution?

• It is bell-shaped.
• It is unimodal.
• The mean is 0 and the standard deviation is 1.
• It is asymmetrical.

Find the area under the standard normal curve that lies to the right of z=-0.67.

• 63.42%

• 25.14%

• 74.86%

• 50%

• 99.04%

• 0.96%

• 98.93%

• 97.68%

• 92.22%

• .9222%

• 92.07%

• .9207%

A data set has a mean of 290 and a standard deviation of 20. Calculate the z-score for an x value of 265.

A data set has a mean of 20 and a standard deviation of 3. Calculate the z-score for 23.

Find the area of the shaded region given z = 1.85

• 0.9678

• 0.0321

• 0.8735

• 0.9239