A level of confidence, sample size and _________ are required to find t-limits from the Student t-distribution. A. Standard error. B. Marginal error. C. Degrees of freedom. D. Variance. 1.10 The confidence interval general format is___________________. A. [Point Estimate (Sample Mean)(Standard Error)]. B. [Point Estimate (Critical Value )(Variance)]. C. [Point Estimate (Critical Value )(Standard Error)]. D. [Variance (Critical Value )(Standard Error)].