1. Explain the Westgard R4s rule and what type of error it detects.
2. The following results for the new Level 1 Control were obtained. Define and calculate the mean, median, mode, SD, and CV of the data.
   1. 106
   2. 115
   3. 83
   4. 120
   5. 111
   6. 127
   7. 119
   8. 100
   9. 104
   10. 83
   11. 105
   12. 107
   13. 106
   14. 110
   15. 106
   16. 106
   17. 110
   18. 112
   19. 108
   20. 108
   21. 109
   22. 110
   23. 109
   24. 114
   25. 102
3.  
4. 
   

3. Which terms/definitions refer to measurement of dispersion of the data around the mean? 4. Draw a Levey-Jennings chart for the new Level 1 Control above and plot the data. Use Excel 5. Questions: 1. Explain the difference between a random error and a systemic error and some causes of systemic error 2. list the 2 types of systemic error. 3. What Westgard rules are violated for random errors 135 R45?State if you reject the run or not. 4. What Westgard rules are violated for systemic errors 225, 415?State if you reject the run or not 5. Calculate the diagnostic % sensitivity and % specificity of the urine pregnancy test given the data below. 6. Table of Number of Pregnancies and Urine Pregnancy test Results Patient is Pregnant? Patient has positive pregnancy test Patient has negative pregnancy test Row totals Yes 32 40 No 5 148 total 37 188 8 143 151