scientific method

Question 1

reliable

Answer 1

An experiment is to be classified as reliable if it has been completed a total of three times

Question 2

accuracy

Answer 2

A measurement result is accurate if it is close to its ‘true value ‘ of the quantity being measured. For example if a substance has mass of 2.7 grams but the value of the mass is 3.3 grams then the measurement is in accurate since it is not close to its true value.

Question 3

measurment error

Answer 3

the difference between the measured value and the true value is known as a measurment error.

Question 4

precise:

Answer 4

how closely to or more measurment values agree with eachother. eg. if a subtance was weighed 5 times and there was a mass of 2,70 obtained each times the results are classified as precise.

Question 5

repeatable:

Answer 5

refers to the closeness of agreement between results obtained with the same method, same materials and same conditions.

Question 6

reproducibility:

Answer 6

Is the closeness of agreement between results obtained with the same method and test material but a different lab and observer.

Question 7

validity

Answer 7

Data is said to be valid if the measurements are only effected by the IV and all other variable are controlled.

Question 8

hypothesis:

Answer 8

an educated guess or prediction for the expected outcome for the experimnet

Question 9

IV

Answer 9

Stands alone and is not effected by the DV. Eg doctors per 10,000 x axis

Question 10

DV

Answer 10

is effected by the IV eg life expectancy

Question 10

control variable

Answer 10

any variable that must be held constant in a research study. eg. amount of sunlight on plant growth - C.V would be the same no rain/ or same amount of rain as water effects growth

Question 11

double blind