How much more likely are alcoholics to say sober for a year after counseling if their best friend is not an alcoholic vs. if their best friend is an alcoholic?  A researcher tracked 747 alcoholics whose best friends were not alcoholics and 517 alcoholics whose best friends were alcoholics.  A year later 570 of those whose best friends were not alcoholics stayed sober for the year and 207 of those whose best friends were  alcoholics stayed sober for the year. 1. Come up with the 99% confidence interval for the difference.  Round your answers to four decimal places and present your answers as proportions rather than percents.   ( __________ , ____________ )

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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.