O CONFIDENCE INTERVALS AND HYPOTHESIS TESTING Sha Confidence interval for the population mean: Use of the standar. The lifetime of a certain brand of battery is known to have a standard deviation of 23 hours. Suppose that a random sample of 90 such batterles has a mean lifetime of 43.6 hours, Based on this sample, find a 90% confidence interval for the true mean lifetime of all batteries of this brand. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit: I Upper limit:

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.