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Question 15 < > Assume that a sample is used to estimate a population mean . Find the 90% confidence interval for a sample of size 30 with a mean of 46.9 and a standard deviation of 21.2. Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place) д Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. Question Help: Message instructor Submit Question