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The video does a nice job examining Zillow pricing and the accuracy of their Zestimate feature. The above Real Estate information on are Zillows home value estimates accurate was provided by Bill Gassett, a Nationally recognized leader in his field.
This is called a point estimate of h. If the sample is large, H will be a good estimate of h, but by itself it does not tell you how good it is. A 95% confidence interval is a different kind of estimate. It consists of two numbers L (lower) and U (upper), which are derived from the sample in some way without knowledge of the unknown h (or any other unknown parameters) . The interval (L, U) is supposed to contain the unknown h.