A chemist obtained the following data for the percentage of lindane compound in three repeated analyzes of an insecticide. 7.47; 6.98; 7.27 a) That the information about the precision of the method will be obtained from these three data. b) Assuming that s→ϭ= 0.28% lindane information based on long experience with the method, calculate the 90% confidence interval for the mean of the data.

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A: Solution To find the confidence interval for variance we will use excel