Which of the following statements is true of variable overhead costs? A. All the decisions determining the level of variable overhead costs are made at the start of a budget period. B. Activities which add value are of least relevance while planning variable overhead costs. C. Planning of variable overhead costs includes choosing the appropriate level of capacity. D. The level of variable overhead costs incurred in a period is mainly determined by dayminustominusday operating decisions.

Suppose a mutual fund qualifies as having moderate risk if the standard deviation of its monthly rate of return is less than 3%. a mutual-fund rating agency randomly selects 27 months and determines the rate of return for a certain fund. the standard deviation of the rate of return is computed to be 2.19%. is there sufficient evidence to conclude that the fund has moderate risk at the alpha equals 0.05 level of significance? a normal probability plot indicates that the monthly rates of return are normally distributed.