A T score and Z Score are Used in Hypothesis Essay Assignment Papers.
 
When to use a T Score:

The sample size is below 30
The population standard deviation is unknown (estimated from your sample data).
the variation of scores in the two groups is not reliably different.A T score and Z Score are Used in Hypothesis Essay Assignment Papers.
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You must know the standard deviation of the population and your sample size has to be above 30 in order to use the Z score. If it doesn’t meet these criteria then use the T score.A T score and Z Score are Used in Hypothesis Essay Assignment Papers.
T-scores are used when the conversion is made without knowledge of the population standard deviation and mean
When to use, a Z score:

The standard deviation must be known and the sample size must be above 30.
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A Z-score tells you how many standard deviations from the mean your result is. The standard deviation must be known and the sample size must be above 30.A T score and Z Score are Used in Hypothesis Essay Assignment Papers.