Assignment submission rate in statistics falling

The submission rate as a percentage of all students in MS 150 Statistics, both sections, is falling over time.

This is negatively impacting student performance as missing assignments zero out. This term I am experimenting with no locking out of late submissions, so in theory these numbers could improve with time. The trend, however, is a matter for concern as the drop represents students who apparently were able to submit assignments and now are not submitting assignments. I have no further insight into the possible causes at this time. 

MS 150 Statistics has the best data in terms of number of assignments and number of students, but there are signs that this is happening in my other courses as well. Only MS 150 Statistics is generating large enough sample sizes to be certain that there is a trend.

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