A survey of the white and nonwhite population in a local area reveals the following annual trip frequencies to the nearest state park: X = 4.1 X, = 3.1 s = 14.3 s = 12.0 n=20 n=16 Assume that the variances are equal. Test the null hypothesis that there is no difference between the park-going frequencies of white and nonwhite. Show steps. A researcher is interested in differences in travel behavior for residents living in three regions. From a sample size of 36 (12 in each region), she finds that the mean commuting distance is 5.0 miles and that the standard deviation is 4.0 miles. Suppose that the standard deviations for each of the three regions are 3.0, 4.0, and 5.0. Fill in the following ANOVA table. Show steps. Sum of squares df Mean square Between Within Total Do you reject the null hypothesis that there is no difference in commuting distance between the three regions?

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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.