A random sample of 23 patients has an average time for a kidney stone to pass of 2.5 days and a standard deviation of 0.63. Find the 91% confidence interval for the population mean and round all values to two decimals.
Added by Shane G.
Step 1
The margin of error (E) can be calculated using the formula: E = Z * (σ / √n) where: - Z is the z-score corresponding to the desired confidence level. For a 91% confidence level, the z-score is 1.645. - σ is the standard deviation of the sample (0.63). - n is the Show more…
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