True or False

A negative z score must yield a negative probability value.

You cannot have a negative probability.

I thought that was the case but could not find the support. Thanks!

#28) To find the probability of selecting one event or another, the separate probabilities should be added.

False.

A negative z score does not necessarily mean that the corresponding probability value will be negative. A z score represents the number of standard deviations a particular value is from the mean in a normal distribution. The probability associated with a given z score is the area under the curve to the left of that z score.

In a standard normal distribution (with mean 0 and standard deviation 1), a negative z score indicates that the value is below the mean, while a positive z score indicates that the value is above the mean. However, the probability associated with a negative z score is always a positive value because it represents the area under the curve to the left of that score.

To get the probability associated with a negative z score, you can use a z-table or a statistical software to find the corresponding area. A z-table provides the probability values for different z scores, and it is usually provided in the appendix of statistics textbooks or available online. By looking up the absolute value of the negative z score in the z-table, you can find the probability associated with it.