For the Quarter Just Ended, Halston, Inc

For the quarter just ended, Halston, Inc. reported the following variances in one of its manufacturing departments:
Material price variance, U
Material quantity variance, F
Labor efficiency variance, F
Labor rate variance, negligible
Machine hours efficiency, F
The sum of the favorable variances exceeded the unfavorable materials price variance by a considerable amount. The quality of the output from the department was the same as usual. Halston 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.