One sample t-confidence level would be most appropriate if a financial economist wants to estimate the true mean us tax rate for residential properties.
The single sample t technique verifies if the population mean is equal to a given value, which is the null hypothesis. If this number is zero (or not entered), the sample mean's confidence interval is given.
Tax rate for residential properties can be calculated by one-sample t-confidence interval level as the data is simply the population of US residents and we just need to find the population mean which can be done through one sample t-confidence level.
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