If Mr. England charge in special learning English 1200 and then estimate the score's English is known to calculate 95% confidence interval of the average test scores.
If the British charge in extra classes in English 1200 baht and an estimate of how much the scores of English. In addition, the calculation of a confidence interval of 95% on the average.
If you"re British cost in studying English 1200) and the estimated value of the remedial English exam score is a wise decision. In addition to calculate the confidence interval of the average test score, 95%