Testing of Hypothesis and Significance:

t-Distribution: T-test is used to measure two means. When δ2 is unknown and n> 30, then for a large sample size, Z-test will replace δ2 by S. When n < 30 and population standard deviation is unknown, then t-test instead of Z-test will be used. T-test can be symbolically expressed as; t = (X-µo)/ δ√n with n-1 degree of freedom. ................
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