Question
The lengths of text messages are normally distributed with a population standard deviation of 3 characters...
The lengths of text messages are normally distributed with a population standard deviation of 3 characters and an unknown population mean. If a random sample of 26 text messages is taken and results in a sample mean of 29 characters, find a 98% 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:
(27.49,30.51)
(27.85,30.15)
(27.39,30.61)
(27.63,30.37)
(28.20,29.80)
(27.97,30.03)
Homework Answers
Answer #1
Given,
Confidence interval for population mean is,
Answer is (D)
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