For the Quarter Just Ended, Sandro Company Reported the Following $\mathrm{U}$

For the quarter just ended, Sandro Company reported the following variances in one of its manufacturing departments: Material price variance, $\mathrm{U}$
Material quantity variance, $\mathrm{F}$
Labor efficiency variance, $\mathrm{F}$
Labor rate variance, negligible
Machine hours efficiency, $\mathrm{F}$ The sum of the favourable variances exceeded the unfavourable materials price variance by a considerable amount. The quality of the output from the department was the same as usual. Sandro operates very close to a JIT system for materials purchases, with virtually all material acquired during the quarter being used in manufacturing activities.
Required:
Is there any connection among these variances? If so, explain.