Answer to Question 1
a) Is this a one- or a two-tailed test?
This is a two-tailed test.
b) What are H0 and Ha for this study?
H0: mprivate school children = mchildren in general population; Ha: mprivate school children mchildren in general population
c) Compute zobt.
zobt = 2.02
d) What is zcv?
1.96
e) Should H0 be rejected? What should the researcher conclude?
Yes, H0 should be rejected. The research should conclude that children in private schools do
score higher on a general test of intelligence in comparison to children in the general
population.
f) Calculate the 95 confidence interval for the population mean, based on the sample mean.
74.1-132.9
Answer to Question 2
d