1. Scientific, data analysis, variables

Question 1

Validity

Answer 1

suitability of the methods use to answers the questions asked

Question 2

Control variable

Answer 2

Variables other than the IV and DV that are kept constant. Change in those variables affect validity

Question 3

Accuracy

Answer 3

Closeness of measurement result to the true value.

Question 4

Anomaly (outlier)

Answer 4

Value in a set of results that is judged not to be part of the inherent variation. Identified by repeating measurement

Question 5

DV and IV

Answer 5

DV: variable being measured
IV: Variable being changed

Question 6

Precision

Answer 6

Closeness of agreement b/w measured values obtained by repeated measurement. Reduces effect of random error. Does not affect systematic error

Question 7

Random Error

Answer 7

Error in measure due to uncontrollable effects. Contribute to uncertainty. Reduce by taking more measurements and calculating mean

Question 8

Range

Answer 8

Max and min values of IV or DV

Question 9

Repeatability

Answer 9

Precision obtained when measurement results are produced in one lab, by a single operator, using same conditions and over a short time scale. Repeatable if it gives same result. Identify outliers.

Question 10

Reproducibility

Answer 10

Precision obtained when measurement results are produced but different labs. Diff operators using diff pieces of equipment. Reproducible, increased confidence in result quality

Question 11

Systematic error

Answer 11

Measured value differs from true value by the same amount each time. Equipment or method contribute to uncertainty

Question 12

Magnification

Answer 12

of times larger the image is compared to the object

Question 13

Resolution

Answer 13

Ability to distinguish b/w two separate point. Light=50-200 nm. TEM=0.05-1.0nm

Question 14

Differential staining

Answer 14

Provides contrast, stain organelles e.g nucleus and chromosomes.