The common symptoms of an overactive thyroid are weight loss, increased appetite, irritability, rapid heart rate and anxiety, according to the Office on Women's Health, whereas underactive thyroid symptoms include weight gain, cold sensitivity, fatigue, depression and muscle weakness.
Z-Scores Explained. A z-score is a score that falls somewhere within the standard normal distribution. Its counterpart on the standard distribution is the standard score. The standard normal distribution and z-score allow all the standardized scores to be weighed equally through a few calculations. z-score is a score that falls somewhere within the standard normal distribution. Its counterpart on the standard distribution is the standard score. The standard normal distribution and z-score allow all the standardized scores to be weighed equally through a few calculations.
Standard Scores and Scaled Scores. 1  Measure how far the student scored from the average in terms of the average spread of scores for the whole group. 2  A standard score of 115 or scaled score of 13 means the student scored one standard deviation above the average (which would be the 84 th percentile rank).