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 29 text messages is taken and results in a sample mean of 30characters, 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 |
select the correct answer below:
(28.56,31.44)
(29.29,30.71)
(29.08,30.92)
(28.70,31.30)
(29.02,30.98)
(28.91,31.09)
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