post lab discussion: exp. 1

Question 1

amt. of matter in an object

Answer 1

mass

Question 2

weighing by difference

Answer 2

(mass of container + object to weigh) – mass empty container

Question 3

direct weighing

Answer 3

making use of tare button or re-zero

Question 4

identify the balance used:
most weighing of amounts that are specified to only two or three significant figures

Answer 4

top loading balance

Question 5

identify the balance used:
used whenever you desire four or
more significant figure accuracy

Answer 5

analytical balance

Question 6

what is the accuracy of
top-loading balance -
analytical balance -

Answer 6

top-loading balance - +/-1mg
analytical balance - +/- 0.1mg

Question 7

what is the reason to not handle objects to be weighs with bare hands

Answer 7

as moisture, grease and dirt on our fingers will affect the weight of the objects

Question 8

to weigh accurately, all objects must be at ____

Answer 8

room temperature

Question 9

space occupied by matter

Answer 9

volume

Question 10

this instrument iis not design to measure volumes accurately

Answer 10

beaker and flask

Question 11

what type of pipet is used in experiment 1

Answer 11

serological pipet

Question 12

it is the process of configuring an instrument to provide a result for a sample within an acceptable range

Answer 12

calibration

Question 13

This technique works for
thermometers, spring scales, and
other measuring instruments as well.

Answer 13

scale increments

Question 14

difference between
population -
sample -

Answer 14

population - population
sample - subset of population

Question 15

this is obtained through the process of sampling

Answer 15

sample

Question 16

it is referred to as measures of center or central location

Answer 16

Measure of central tendency

Question 17

also known as the arithmetic
average

Answer 17

mean

Question 18

middle value in distribution when the values are arranged in ascending or descending order

Answer 18

median

Question 19

it describes the reproducibility of
measurements; the closeness of results to each other.

Answer 19

precision

Question 20

range is also called as

Answer 20

spread

Question 21

Another term to describe the precision of a set of replicate results.

Answer 21

range

Question 22

a statistically useful description of the scatter of the values determined in a series of runs

Answer 22

sample standard deviation

Question 23

sample standard deviation:
* large std. dev. =
* small std. dev =

Answer 23

• large std. dev. = far from the mean
• small std. dev = close to the mean

Question 24

it is the ratio of the standard deviation to the mean

Answer 24

coefficient of variation

Question 25

coefficient of variation is another method of describing ____

Answer 25

precision

Question 26

it indicates the closeness of the measurement to its true or accepted value and is expressed by the error.

Answer 26

accuracy

Question 27

two values resulting from calculating the confidence interval.

Answer 27

confidence limit

Question 28

it provides the best estimate of the population’s or sample’s mean

Answer 28

confidence interval

Question 29

reporting computed data: one of the best way of indicationg reliability is to give a confidence interval at the ___ or ___ confidence limit

Answer 29

90% or 95%

Question 30

it tests for outliers

Answer 30

Q-test