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Please solve using all working The drying time of a certain type of plant under specified conditions is known to be normally distributed with mean

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Please solve using all working

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The drying time of a certain type of plant under specified conditions is known to be normally distributed with mean value 75 min and standard deviation of 9 min, Chemists have proposed a new additive designed to decrease the average drying time. Consider testing the null hypothesis of u = 75 against the alternative u

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