Stats + QC

Question 1

Sensitivity

Answer 1

True Pos / (True Pos + False Neg)

Question 2

Specificity

Answer 2

True Neg / (True Neg + False Pos)

Question 3

PPV

Answer 3

True Pos / (True Pos + False Pos)

Question 4

NPV

Answer 4

True Neg / (True Neg + False Neg)

Question 5

False Positive Rate

Answer 5

False Pos / (True Neg + False Pos)

P(correctly classifying nondiseased person)

= 1 - Specificity

Question 6

False Negative Rate

Answer 6

False Neg / (True Pos + False Neg)

P(correctly classifying diseased person)

= 1 - Sensitivity

Question 7

SD of normal distribution

Answer 7

1 SD = 68.26%

2 SD = 95.46%

3 SD = 99.73%

Question 8

Westgard Rule 2(2S)

Answer 8

2 consecutive measurements outside 2 SD on the same side

Question 9

Westgard Rule R(4S)

Answer 9

1 measurement beyond 2SD on one side, another outside 2SD on the other side

Question 10

Westgard Rule 10(x)

Answer 10

10 consecutive measurements on the same side of the mean

Question 11

Six sigma DMAIC

Answer 11

Define
Measure
Analyze
Improve
Control

Question 12

Z Score

Answer 12

(Result - mean) / SD

Gives # of SD for a particular result