Theoretical Underpinnings: Q. 11. Suppose that Amy administers the WAIS (a standardised measure of IQ) on five randomly selected PSYC123 students, and obtains a sample mean of 108 and a standard deviation of 12.5 on those students' IQ scores. Harry administers the WAIS on another five randomly selected students from the same PSYC123 student population, and obtains a mean of 130 and a standard deviation of 19.8 for his sample. Tracey administers the WAIS on every enrolled PSYC123 student, and obtains a mean of 100 and a standard deviation of 15. Why do they get such different results? What statistic, if any, will they need to use in order to apply their findings to the distribution of IQ scores for the entire PSYC123 student population? Explain your answer by drawing on your understanding of sampling distributions. (Your answer should be quite detailed). (2 marks)