According to an​ almanac, 60​% of adult smokers started smoking before turning 18 years old. ​(a) If 300 adult smokers are randomly​ selected, how many would we expect to have started smoking before turning 18 years​ old? ​(b) Would it be unusual to observe 270 smokers who started smoking before turning 18 years old in a random sample of 300 adult​ smokers? Why?

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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.