This paper takes Probability Theory and Mathematical Statistics course as an example, and takes WeChat public platform as the carrier, discusses the blended ratio of time between online learning and face-to-face teaching, and makes a study on teaching effect by using group comparison method. The results show that blended ratio 2: 6 is significantly better than 1: 6, 3: 6 and 0: 6 for online learning and face-to-face teaching. The results have some significance for improving the utilization rate of existing educational resources, allocating teaching time rationally and improving teaching quality.
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