The National Weather Service says that the mean daly high temperature for October in a argemidwestem ity is 52 "F. A local weather service suspects that this value is not acurate and wants to perform a hypothesis tes to detemine whether the meanis actully ower han 52 F. A sample of mean daly high temperatures for October ver he past 32 years ieds x = 50 "F. Assume tht the population standard deviation is 5.2 °F. Perform the hypothesis test at the a=0.05 signficance level. Ho : µ = 52 °F Hị : µ< 52 °F_ Test statistic : z = -2.18 Critical value : z = -1.64 Reject Ho : = 52 °F there is sufficient evidence to support the claim that the mean is less than 52 °F. Ho : µ = 52 °F Hị : µ > 52 °F Test statistic : z =-2.18 Critical value : z = -1.64 Fail to reject H, : u = 52 °F there is not sufficient evidence to support the claim that the mean is less than 52 °F.

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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.