Elementary Statistics and Computer Application

Test Statistic

Test Statistic

• The sampling distribution of a statistic like Z, t, & χ2 are known as test statistic.
• Generally, in case of quantitative data


Note

• The choice of the test statistic depends on the nature of the variable (ie) qualitative or quantitative, the statistic involved (i.e) mean or variance and the sample size, (i.e) large or small.

Level of Significance

• The probability that the statistic will fall in the critical region is . This α is nothing but the probability of committing type I error. Technically the probability of committing type I error is known