2. In the study described in the paper, "Exposure to Dlesel Exhaust Induces Changes in EEG in Human Volunteers," 10 healthy mean were exposed to diesel exhaust for 1 hour. A measure of brain activity (called median power frequency, or MPP in Ha) wM recorded at the same location in the brain both before and after the diesel exhaust exposure. The reulting data are given in the accompanying table. For purposes of this exercise, aame that the sample of 10 men is representative of healthy adult males Subject MPF Before (in HZ)648.77487 9.8 MPF After (in H2) 10 6,6 8.9 8.0 12.0 8.49.0 8.4 11.0 144113 7111.2 6. 93 7.4 Difference Construct and interpret a 90% confidence interval estimate for the difference in mean MPF before and after exposure to diesel exhaust Estimate: Method: T: N. Check: Calculate: Communicate:

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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.