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A researcher collects a sample of 11 measurements from a Normally distributed population and wishes to find a 90% confidence interval for the population mean. What value should he use for ? (Recall that the number of degrees of freedom for a one-sample t-test is given by di = n - 1, where n is the sample size.) E Click the icon to view the I-distribution table. To find a 90% confidence interval for the population mean, he should use for " (Round to three decimal places as needed.)