4. James wants to determine what colour people want for the new Tesla car being released. The population of their customer base can be divided up as shown in the table below. a) If a stratified sample of 120 is to be used, how many 45 – 70 year olds should be surveyed? b) Describe how you might take a cluster sample of this population. Explain the differences between this and a stratified sample of the same population.

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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.