Question

The normal curve with a mean of 0 and standard deviation of 1 is called ______________.
a. standard normal curve.
b. the emperical rule.
c. a random variable.
d. the z-value.

Answer 1

The normal curve with a mean of 0 and standard deviation of 1 is called (D)  the z-value.

What is a standard score (z-value)?

• The z-score value indicates how many standard deviations you are from the mean.
• A z-score of 0 indicates that the data is on the mean.
• A positive z-score indicates that the raw score exceeds the mean average.
• For example, a z-score of +1 indicates that it is one standard deviation above the mean.
• The number of standard deviations by which the value of a raw score (that is, an observed value or data point) is above or below the mean value of what is being observed or measured is referred to as the standard score in statistics.
• Raw scores that are higher than the mean have positive standard scores, while those that are lower than the mean have negative standard scores.

Therefore, the normal curve with a mean of 0 and standard deviation of 1 is called (D)  the z-value.

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