A polling company conducts an annual poll of adults about political opinions. The survey asked a random sample of 434 adults whether they think things in the country are going in the right direction or in the wrong direction 42% said that things were going in the wrong direction. Complete parts a and b below. ​ a) Calculate the margin of error for the proportion of all adults who think things are going in the wrong direction for 95% confidence.

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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.