4.13. Four samples have been collected randomly from a soil pit containing arsenic. These initial TCLP concentrations are 6.1, 4.2, 5.8, and 6.5 mg/L. Determine the number of samples required to estimate the true population mean at the 95% con- fidence level based on the difference between the initial mean and the TCLP value.

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A: Hey there! Thank you for posting the question.  Since there are multiple questions posted, we will…

A: We\'ll start by distributing both the sides of the inequality as shown on the board

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