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Mathematics, 02.12.2019 18:51

Aresearcher in a small midwestern town wants to estimate the mean weekday sleep time of its adult residents. he takes a random sample of 40 adult residents and records their weekday average sleep time as 6.4 hours. the researcher knows that the population standard deviation is 1.8 hours.
what is the lower confidence limit (lcl) of the 95% confidence interval for the mean weekday sleep time of all adult residents of this midwestern town? round your answer to 2 decimal places.

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