Researchers are interested in the mean age of a certain population. A random sample of 45 individuals drawn from the population of interest has a mean of X = 29. Assuming that the population is approximately normally distributed with variance ? = 20, can we conclude that the mean is different from 0 = 35 years ? (? = 90%) .

1 . Researchers are interested in the mean age of a certain population. A random sample of 45 individuals drawn from the population of interest has a mean of X = 29. Assuming that the population is approximately normally distributed with variance 0 = 20, can we conclude that the mean is different from [40 = 35 years '2' (a = 90%) . [20] 2. According to the records of the National Safety Council, accidental deaths in the Bahamas during 2012 had the following distribution according to the principal types of accidents. Shakauacks suavbunet Suppose that an accidental death data set from a particular geographical region yielded the following frequency distribution for the principal type of accidents _