General direction:

a) State the null and alternative hypothesis for each problem.

b) Set the level of significance at 5%.

c) Calculate the test statistics. Write the name of the statistical test used in the computation.

Support your answer from the computation in MS Excel.

d) Interpret and analyze the results of the data.

e) Make a conclusion.

Question 4

A psychologist is interested in determining whether left-handed and right-handed people differ in spatial ability. She randomly selects 10 left-handers and 10 right-handers from the students enrolled in the university where she works and administers a test that measures spatial ability. The following are the scores (a higher score indicates better spatial ability). Note that one of the subjects did not show up for the testing.