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.
We'll begin with z scores. z scores can be computed by equating the mean of the raw score distribution to 0.00 and the standard deviation to 1.00. T-scores are directly related to z scores. With T-scores, the mean of the raw score distribution is equated to 50, and the standard deviation is equated to 10. Therefore, a z score of +1.00 would be equal to a T-score of 60. In general z scores are expressed as decimals carried out to the hundredths place and T-scores are expressed as whole numbers. Thus, a z score of -3.00 is equal to a T-score of 20.