in october, the campus bookstore asked a random set of freshman and seniors how much they had spent on text books that semester. the bookstore believes that the two groups spent the same amount. what is an appropiate test value for a z test.  A). 1.21    B). 0.22    C). 2.10    d).9.51   freshmen seniors sample size 80 70 sample mean $460 $440 population Std. dev. $52 $63

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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.