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The true mean drying time for a certain type of paint under specified test conditions
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The true mean drying time for a certain type of paint under specified test conditions is know to be 75 minutes. Chemists have proposed a new additive designed to decrease the mean drying time. Suppose it is know that drying times follow a normal distribution with a standard deviation of 9 minutes. They test the new paint on a random sample of 36 specimens, and find an average drying time of 73 minutes. Is this strong evidence to suggest that the trues mean drying time with the additive is less than 75 minutes using a level of significance of 0.01?
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[Solved] The true mean drying time for a certain type of paint under specified test conditions
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- Submitted On 26 Jul, 2020 08:14:28
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