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Problem 3
9.5 t-Interval to Compare Two Population Means: Independent Samples (Unequal Variances)
Who gives a higher real estate assessment? In an experiment, a single home was assessed by a both real estate appraisers and local government tax assessors. A randomly selected sample of 22 appraisals done by the real estate appraisers had an average value (in thousands) of $212.1 with a standard deviation of $8.48. A randomly selected sample of 23 appraisals done by tax assessors had an average $225.3 with a standard deviation of $9.01. Find the 90% confidence interval for the true mean difference between the two types of appraisals (Do not assume equal variances). Is there a significant difference?
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