Question: A psychologist wants to test if first born children develop better verbal skills than children in general. It is known that children have an average score of 70 at age 2 on a verbal skills test with a standard deviation of 15. How many first born children does the psychologist need to test on verbal skills at age 3 to test her hypothesis if she wants alpha = .01 and beta =.10 when H₁ = 75?