t-test

Often called Student’s t-test. A statistical
test of significance in which the difference between two mean values is
tested. The null hypothesis is that there is no difference between the
two means. The test is carried out by calculating a t-value, then
comparing the calculated t-value with a critical t-value which is
obtained from a statistics table. If the calculated t-value is greater
than the critical t-value, the null hypothesis is rejected; this means
that a statistically significant or real difference exists between the
mean values being compared. If the calculated t-value is less than the
critical t-value, the null hypothesis stands, therefore no difference
has been observed between the two mean values.

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