Normal Bell Curve The standard deviation of a test score can be a helpful measure when determining if occupational therapy services are needed. OTs typically use the standard deviation as a determining factor when deciding whether a childβs test score is sufficiently below the mean to warrant occupational therapy services. One SD from the average or standard score isnβt statistically significant.
Interactive Bell Curve | Standard Scores, Scaled Scores, T-Scores, & Percentiles

T Score To Standard Score
When to know if you should use t score vs. z score
Standard Score to Standard Deviation Chart (Standardized Testing Reference)


T Score To Standard Score Conversion
Your T-score shows how much your bone mass differs from the bone mass of an average healthy young adult in their twenties It is measured in standard deviations and helps determine whether your bone mass is in a normal range. Check out our Osteoporosis Guide which includes "Understanding Your T-Score." Link above.


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T Score To Standard Score Calculator
Bell Curve with various standard scores
Calculate probability of a range using Z Score









T-Distribution | What It Is and How To Use It (With Examples)