Assignment for Algebra Expert

1. Any distribution of values may be completely and accurately described by presenting three pieces of information. What are those 3 pieces?

2. What distinguishes a true experiment from a quasi experiment?

3. What two inferences can be drawn from data collected from a sample?

4. For the following hypothesis, what is the dependent variable: Nursing students who learn health assessment “on-site” receive higher scores on the NCLEX than nursing students who learn health assessment through a virtual, on-line course ?

5. In what form is the hypothesis in question # 4 stated?

6. For a research study in which the outcome of the intervention is measured as “optimal” vs. “sub-optimal,” what level of measurement is employed?

7. If a distribution of scores has a mean of 65.5, a median of 77.8 and a standard deviation of 15, what is the shape of the distribution?

8. What measures of central tendency and variability are appropriate in describing a multi-modal distribution shape?

Central Tendency:_____________________

Variability:____________________

Briefly define each of the following:

9. Statistic:

10. Frequency Polygon:

11. Percentile:

12. Ordinal Data:

Items 13-18 relate to a distribution having a mean of 100 and a standard deviation of 15.

13. If this instrument is used to screen for pathological conditions and the highest 10% are screened as “presumptive positives,” what is the cut-off score for a positive screen?

14. What percent of the general population would be expected to score between the raw scores of 90 and 110?

15. If you used this instrument to provide relative rankings for students in terms of their scores, who would score higher, Student A with a z score of .70, or Student B with a raw score of 113?

16. If you took the test as a preliminary measure of knowledge in differential diagnoses and received a score of 120, what percent of the population scored higher than you?

17. If this were a certification exam in which the minimum passing score is 85, did student A, who received a z score of -.67, pass the exam?

18. If a researcher wished to study only the middle 50% of the population, above and below which raw scores should she exclude potential subjects?

19. Organize the following raw data into a frequency distribution:

15 15 16 16 16 17 17 17 17 17 18 18 19 19 19 20 20 21

20. For the frequency distribution you prepared for item 19 (above), present the data as a histogram:

The remaining items relate to the following data:

x f

30 2

31 4

32 5

33 7

34 9

35 6

36 6

37 9

38 5

39 4

40 3

Provide the following statistical data:

21. Mean:________ 28:. Shape:____________________

22. Median:________ 29: Appropriate Measure of

Central Tendency: __________

23. Mode: _______

24. Range: __________ 30. Appropriate Measure of

Variability: _________________

25. Variance: ________

26. Standard Deviation: ______

27. Q:________