The"t" test, (called the "small 't' test, to distinguish it from the large 'T' test) is a test for deviation from a known norm, using a smaller sample set than the one required by the large T test.
It is said to have been developed by the head of quality control at the Guinness Brewery in Ireland.
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t test, because the z test requires knowing the population standard deviation and that's rare. The t test embodies an estimate of the standard deviation.
d
The Independent Samples T Test compares the mean scores of two groups on a given variable.
t test is used when- a) variables are studied b)the size of sample is a small one.(n<30) chi square test is studied when a) attributes are studied
yes