Researchers are interested in the mean age of a certain sample population. A random population of 10 individuals are drawn and has a mean 0127. If we assume that the population is approximately normally distributed with variance 20, can we actually conclude that the mean is different from 30 years? Use alpha 0.05. Using the statement ad given in question number 4. What if the researches want to know if we can conclude that p 30 or n30 Your hypothesis is that the average mean age in the casino is lower, therefore, this problem has a direction (one tailed test) specifically, left-tailed C. HYPOTHESIS Ho: W = 28 H o: U 0.05 Ho is a 22/25 CONTEXTUAL DECISION We are 95% sure that there is no significant difference between the test scores of students who studied physics under method A or method B