27. This distribution is used to determine the probability of an event by transforming the mean of the sample to an approximately standard normal variable when the population variance is given. A. t-Distribution B. Z-Distribution C. Chi-Square Distribution D. Pearson Correlation Coefficient 28. Which of the following notations is used for the mean of the population? А. и B. µã С.о D. 0ž 29. Which of the following equations is the formula used to estimate the numerical characteristics of the population where the population variance is unknown, and the sample size is less than 30? A. z = C. t= X-u B. z = D. t =

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