A nursing school professor is interested in determining how her college students compare to the national average when it comes to the Final Practicum Exam. The exam has a = 100 and = 20. There has been no evidence to suggest whether those seniors score better or worse than the national average and she is curious as to how her class (N=17) compares.

Data

Students Exam Score

1-120

2-100

3-110

4-90

5-130

6-123

7-101

8-115

9-111

10-99

11-105

12-119

13-128

14-109

15-98

16-95

17-102

1. Write the null and alternative hypothesis in statistical form: _________________________________ _________________________________

2. Determine the mean for the sample:

3. Apply the z-test formula Zobt = ___________

4. Is this a one-tailed (directional test) or a two-tailed (non-directional test)? ______________________

5. What is your alpha level set to? = ___________

6. Determine the critical value(s) (Zcrit) = ___________

7. Label the critical value(s) and indicate the position of the Zobt on the distribution: (Graph)

8. Write the z result in the correct form: ____________________________________