Late last year Mindmine Online Company organized seminars in various schools of a city, to promote a new online English learning program. As of the month end, there were 453 active subscribers of the program. However, a survey conducted recently among the active members found no significant improvement in English language skills among more than half of these. The other half, or less than half, on the other hand, showed great improvement in the language skills.
Which of the following options can best explain the possible reason for the results of the survey?
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