A city planner wants to estimate the average monthly residential water usage in the city. He selected a random sample of 38 households from the city, which gave the mean water usage to be 3406.60 gallons over a one-month period. Based on earlier data, the population standard deviation of the monthly residential water usage in this city is 387.30 gallons. Make a 97% confidence interval for the average monthly residential water usage for all households in this city. Round your answers to two decimal places.

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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.