1. Use the following data below to solve for the following:
   1. Means of the groups (for problem # 1 only)
   2. Standard deviations of the samples (for problem # 1 only)
2. Test the hypothesis using appropriate statistical tool/s

Problem # 1.

A teacher gave a pretest, then she scolded the pupils to test whether stress will affect their performance. After giving the posttest she selected 9 students and record the results of the test:

Student	1	2	3	4	5	6	7	8	9
Pretest	7	9	4	15	6	3	9	12	11
Posttest	5	15	7	11	4	7	8	16	13

Find whether stress affect the performance.

Problem # 2.

An aptitude test in engineering was given to 60 male and 50 female in certain high school. The higher the score the higher is the aptitude of the examinees for engineering. The male got a mean score of 80 with a standard deviation of 9, while the mean score of the female was 76 with a standard deviation of 10. Is the mean aptitude score for engineering of the male students significantly higher than that of the female students.

HYPOTHESIS TESTING
Problem
Null Hypothesis
Alternate Hypothesis
Level of Significance _________	Tabular Value: _______________	Degrees of freedom: ___________________	______ one-tailed test ( ) Left ( ) Right ______ two-tailed test
Statistical Tool: __________________________ Formula: Computation:
Decision Rule
Conclusions