Paired t-test 9. A doctor wants to test if a new “love potion" increases the number of dates over the course of a year. She chooses ten subjects, counts the number of dates over a year, and then gives them the “love potion" for the next year. The data is as follows: Before 12 13 5 11 18 20 After 17 25 7 14 2 10 21 Difference 1 12 2 3 -4 -8 1 (A - B) Can she say that the potion works? (Use a = .10) Ho: mu d = 0 Ha: mu d > 0

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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.