3 8 02:28:39 2-0. Compute a labour rate variance and a labour efficiency variance for the lab. (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance). Do not round intermediate calculation and round your final answers to 1 decimal place.) Labour rate variance Labour efficiency variance 2-b. Not available in Connect. Mc Graw Hill