1.1.4 Basic Principles and Techniques (Laboratory statistics, Gaussian curve))

Question 1

Most commonly used

a. Mean
b. Median
c. Mode

Answer 1

a

Question 2

It corresponds to the center of Gaussian curve

a. Mean
b. Median
c. Mode

Answer 2

a

Question 3

midpoint of a data set after the values have been rank-ordered

a. Mean
b. Median
c. Mode

Answer 3

b

Question 4

most frequently occurring value in a data set

a. Mean
b. Median
c. Mode

Answer 4

c

Question 5

Distribution of data points around the mean

a. Standard deviation
b. Variance
c. Coefficient of Variation
d. Range

Answer 5

Standard deviation

Question 6

Standard Deviation is the ___________ of Variance

Answer 6

Square root

Question 7

Variance is simply the _______ of standard deviation

Answer 7

Square

S^2

Question 8

What is the formula for variation?

Answer 8

Simply remove the square root in Standard deviation

s^2 = (Summation (Mean - x)^2 ) / n -1

Question 9

What is the formula for Coeffcient of Variation?

Answer 9

CV = (S/Mean) x 100

S = Standard deviation

Question 10

Coefficient of Variation is the best indicator of ____________

a. Accuracy
b. Precision
c. Sensitivity
d. Specificity

Answer 10

b

Question 11

CV is Directly proportional to Precision

T or F

Answer 11

F

If CV is High then Precision is Low

Question 12

The rule of thumb for Coefficient variation is less than?

a. 10%
b. 20%
c. 5%

Answer 12

a

Question 13

Formula for Range?

Answer 13

Highest value - Lowest Value

Question 14

It is unreliable when there are outliers

a. Standard deviation
b. Variance
c. Coefficient of Variation
d. Range

Answer 14

d

Question 15

A data set that is display in Gaussian Curve is shape as?

Answer 15

Bell curve

Question 16

A data set that displays normal distribution in Gaussian Curve has a Mean ______ to Median and ______ to mode

Answer 16

Equal, equal

Question 17

What is the Empirical rule of Gaussian Curve?

a. 68-95-99.7
b. 69-95-99.5
c. 67-95-99.7
d. 66-95-99.5

Answer 17

a

Question 18

The most commonly used confidence interval?

Answer 18

95%

Question 19

95% = Mean + 2(standard deviation)

T or F

Answer 19

T

Question 20

Minimum Control Values (n)

Answer 20

20

Question 21

what is the 95% of 40?

Answer 21

38

Question 22

in 95% of n=20, the 5% of this follows the Westgard rule which is?

Answer 22

1 2S