An investor wants to estimate the population mean earnings of stocks in the financial services sector. Assuming the population standard deviation of earnings is σ=$1,250 {“version”:”1.1″,”math”:”sigma = $1,250″}, a confidence interval for which of the following would be best for this task?Question 4 options:μ {“version”:”1.1″,”math”:”mu”}, when σ {“version”:”1.1″,”math”:”sigma”} is knownμ {“version”:”1.1″,”math”:”mu”}, when σ {“version”:”1.1″,”math”:”sigma”} is unknownThe true mean of the differences, for paired dataThe difference between two means, using independent samplesOne proportionThe difference between two proportionsLinear regression

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