Hint: solve P value
A venue notices that bands whose tickets cost at least $30 sell out shows 80% of the time, whereas bands whose tickets cost under $30 sell out shows 65% of the time. Assume the sample size is 60 for each category. The venue concludes that bands increase attendance when they charge at least $30 per tickets, declares that their conclusion is statistically significant, and it tells a band, which current charges $20 per ticket, to raise its price by at least $10 in order to increase attendance. What mistake did the venue definitely make?
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