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The survival times of adult mosquitoes exposed to a commonly used synthetic pesticide (Phenothrin) follow a normal distribution. A random sample of 16 mosquitoes has

The survival times of adult mosquitoes exposed to a commonly used synthetic pesticide (Phenothrin) follow a normal distribution. A random sample of 16 mosquitoes has an average survival time of 47.5 sec, and the sample standard deviation is estimated to be 15.18 sec. What is a 99% confidence interval for the mean survival time?

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