The lengths of text messages are normally distributed with a population standard deviation of 5 characters and an unknown population mean. If a random sample of 24 text messages is taken and results in a sample mean of 25 characters, find a 90% confidence interval for the population mean. Round your answers to two decimal places. z0.10 z0.05 z0.04 z0.025 z0.01 z0.005 1.282 1.645 1.751 1.960 2.326 2.576 You may use a calculator or the common z-values above. Select the correct answer below: (23.32, 26.68) (23.69, 26.31) (23.00, 27.00) (22.63, 27.37) (22.37, 27.63) (23.21, 26.79)
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645 (you can find this value in a standard Z-score table). The standard deviation is given as 5, and the sample size (n) is 24. So, we can plug these values into the formula: Show more…
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The lengths of text messages are normally distributed with a population standard deviation of 5 characters and an unknown population mean. If a random sample of 24 text messages is taken and results in a sample mean of 25 characters, find a 90% confidence interval for the population mean. Round your answers to two decimal places.
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The lengths of text messages are normally distributed with a population standard deviation of 5 characters and an unknown population mean. If a random sample of 26 text messages is taken and results in a sample mean of 24 characters, find a 92% confidence interval for the population mean. Round your answers to two decimal places. z0.10 z0.05 z0.04 z0.025 z0.01 z0.005 1.282 1.645 1.751 1.960 2.326 2.576 You may use a calculator or the common z-values above. Select the correct answer below: (21.96,26.04) (22.66,25.34) (21.31,26.69) (22.39,25.61) (21.57,26.43) (22.28,25.72)
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The lengths of text messages are normally distributed with a population standard deviation of 6 characters and an unknown population mean. If a random sample of 21 text messages is taken and results in a sample mean of 24 characters, find a 99% confidence interval for the population mean. Round your answers to two decimal places. z0.10 | z0.05 | z0.04 | z0.025 | z0.01 | z0.005 1.282 | 1.645 | 1.751 | 1.960 | 2.326 | 2.576 You may use a calculator or the common z-values above. Select the correct answer below: (21.85, 26.15) (21.43, 26.57) (21.71, 26.29) (20.95, 27.05) (22.32, 25.68) (20.63, 27.37)
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