3. My parents just started their digital music collection. If they have put cd's by 4 different groups on their mp3 player how many songs will they need to listen to to ensure that they hear at least one group twice?

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Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.