Most air travelers now use e-tickets. Electronic ticketing allows passengers to not worry about a papel companies less to handle than paper ticketing. However, in recent times the airlines have received complaints from passengers regarding their e-tickets, particularly when connecting flights and a change of airlines were involved. To investigate the problem, an independent watchdog agency contacted a random sample of 20 airports and collected information on the number of complaints the airport had with e-tickets for the month of March. The information is reported below. 16 16 15 12 13 14 13 13 12 15 10 14 13 14 14 12 12 15 14 13 At the 0.05 significance level, can the watchdog agency conclude the mean number of complaints per airport is less than 15 per month? Click here for the Excel Data File a. What assumption is necessary before conducting a test of hypothesis? O Uniform population. O Normal population. O The mean and standard deviation are known. O The population is very large. ONone needed. b. What is the decision rule? (Negative amount should be indicated by a minus sign. Round your answer to 3 decimal places.) Reject HO a 15 when the test statistic is

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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.