exam II

Question 1

normal curve

Answer 1

gaussian distribution: in a normal curve the mean, median and mode are the same

Question 2

degrees of freedom

Answer 2

n-1

Question 3

median

Answer 3

“middle” value in a set of data

Question 4

t-test

Answer 4

a test used to determine if their is a significant difference in the results obtained by two different methods using the same constituent

Question 5

mean

Answer 5

arithmetic average on a set of numbers

Question 6

precision

Answer 6

a measure of how well a measurement instrument reproduces results

Question 7

standard deviation

Answer 7

the dispersion of variable around the mean

Question 8

variance

Answer 8

the sum of the squares of the deviations of the variables from the mean divided by the total of variables less one.

Question 9

correlation study

Answer 9

analysis samples are tests with two different methods and results are plotted on linear graph paper minimum of 40 patient samples ran

Question 10

mode

Answer 10

most often repeated number in a set of numbers

Question 11

accuracy

Answer 11

measure of how close to the true or actual value a physical measurement is

Question 12

coefficient of variation

Answer 12

used to compare the variability of 2 sets of data

Question 13

range

Answer 13

the difference between the highest and lowest value

Question 14

1 SD on both sides

Answer 14

68.27%

Question 15

2 SD on both sides

Answer 15

95.45%

Question 16

3 SD on both sides

Answer 16

99.73%