Non-negative means either zero or positive.
Chat with our AI personalities
No. The absolute value is non-negative but, to be pedantic, that does not mean positive. The absolute value of 0 is 0 which is NOT positive.
No, an absolute value must be non-negative.
No. That is only true for non-negative numbers. The value of a negative number, such as -3 , is negative 3. But its absolute value is 3.
A negative z-score indicates that the observed value (or statistic) was below the mean. In non-directional tests, a negative z-score is just as likely as a positive one.
It means that the number is zero or more, just not less than zero. "Positive" means more than zero. "Non-negative" means either zero or else more than zero.