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Suppose lengths of text messages are normally distributed and have a known population standard deviation...

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Suppose lengths of text messages are normally distributed and have a known population standard deviation of 3 characters and an unknown population mean A random sample of 22 text messages is taken and gives a sample mean of 31 characters What is the correct interpretation of the 90 confidence interval Select the correct answer below We estimate that 90 of text messages have between 29 95 and 32 05 characters O We estimate with 90 confidence that the true population mean is between 29 95 and 32 05 characters We estimate with 90 confidence that the sample mean is between 29 95 and 32 05 characters

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