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 : U=30 and Ha : p 30 c Ho : U=30 and Ha : p = 30 2) What is the critical region? Choose the letter of you answer Blank 2 a + /- 1.96 b +/- 1.645 c +/- 1.0 d +/- 1.33-1.96 3) What is the computed test statistic? Choose the letter of you answer Blank 3 a z =-2.12 bT =-2.12 cZ =-0.47 d T =-0.47 4) Can we conclude that the mean is different from 30 years ? Choose the letter of you answer Blank 4 a Yes, we can conclude that the mean is different from 30. b No, we cannot conclude that the mean is different from 30. c Yes, we can conclude that the mean is less than 30. d No, we can conclude that the mean is greater than 30.Blank 1 Add your answer Blank 2 Add your answer Blank 3 Add your answer Blank 4 Add your