Question

a z score of +1 is above the population mean by exactly 1 standard deviation. false true question 8 0.68 pts z scores can be used to make precise probability statements about the location of a raw score relative to other scores only if the raw scores are normally distributed. true false

Explanation:

1. The z - score is defined as the number of standard deviations a data - point is from the mean. So a z - score of + 1 means the data - point is 1 standard deviation above the mean.
2. The z - score formula $z=\frac{x-\mu}{\sigma}$ is based on the normal distribution. It allows us to make probability statements about the location of a raw score relative to other scores in a normal distribution. In non - normal distributions, the z - score does not have the same probabilistic interpretation.

Answer:

1. true
2. true