The IE Dept. is interested in the mean age of a certain population. A random sample of 10 individuals drawn from the population has a mean of 27. Assuming that the population is approximately normally distributed with variance 20, can we conclude that the mean is different from 30 years ? (a=0.10) 1) What is the null and alternative hypothesis? choose the letter of you answer Blank 1 a Ho : p=30 and Ha : µ < 30 b Ho : p=30 and Ha : u> 30

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