What does a confidence interval around an estimated mean express?

A price index rises from 100 to 121 over two years. What compound annual rate does this represent?

A sample of four sales drawn from a market with 200 annual transactions is:

A set of comparable sales has a mean of $250,000 and a standard deviation of $20,000. What is the coefficient of variation?

A property sold for $400,000 and resold three years later for $463,050 with no physical change. What compound annual rate does this indicate?

An appraiser includes both 'total room count' and 'bedroom count' as independent variables in a regression model estimating single-family home sale prices. The variance inflation factor (VIF) for 'bedroom count' is calculated as 12.3. What is the most appropriate appraisal action based on this result?

An appraiser runs a regression of sale price on GLA, age, and a binary variable for 'renovated' (1 = yes, 0 = no). The estimated coefficient for 'renovated' is $18,400 with a standard error of $6,200 and a t-statistic of 2.97. Assuming a two-tailed test at α = 0.05 and 42 degrees of freedom, what conclusion is supported regarding the market's recognition of renovations?

To validate the functional form of a regression model used for adjustments, an appraiser plots residuals against predicted values and observes a clear inverted-U pattern. What does this pattern indicate, and what is the most defensible corrective action?

A histogram of neighborhood sale prices shows two distinct peaks. What does this most likely mean?

What does it mean to validate a regression model?

An appraiser includes months elapsed since each sale as a variable in a price model. What is this intended to capture?