unknown variance, o. X and s° are the unbiased, sample mean and sample variance estimates of u and o obtained from a small sample size below 25 (n<25). The 95% C.I. is calculated as: : 196 B. ut 1.96 c. Kt4 D.ut A. X±1.96. B. μ+ 1.96. D. μ4 t-1. O A. A В. В С. С D. D O O

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