z scores assessment

The normal curve is symmetrical

• True

• False

(a)   % of scores will fall between -3 and +3 standard deviations in a normal distribution.

The normal curve represents a distribution where the __________, ___________, and ___________ are equal to each other.

• mean

• median

• mode

• all of the above

If the area between the mean and z is .1179, the corresponding z is .64.

• True
• False

Using z-scores, what is the proportion above the mean?

• 13%

• 34%

• 50%

• 99.74%

The standardized normal distribution or z-distribution has a mean of (a)  

The tails of the theoretical normal curve never touch the horizontal axis.

• True
• False

In the z-score formula, the denominator is...

• the mean

• the observation

• always 1

• the standard deviation

Find the z-score of an SAT score of 460 if the mean is 500 and the standard deviation is 100.

• -0.40

• 1.40

• -1.40

• 0.60

For a test with a mean score of 81 and a standard deviation of 5, your score is 78. How could you find your Standard Normal Score, between -3 and +3?

• Subtract the score by the mean and then divide by the standard deviation.

• Subtract the score by the mean.

• Divide the score by the standard deviation

• Subtract the score by the standard deviation.