final exam Flashcards

1
Q

what is a determinate error

A

it is a systematic error that is constantly off in one direction

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2
Q

what is an indeterminate error

A

it is an error that is always present but is random and not constantly off in one direction

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3
Q

what is uncertainty

A

it is a range of values of what it could be

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4
Q

what is explicit uncertainty

A

it is explicitly stated (+/- 0.003)

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5
Q

what is implicit uncertainty

A

it is implied by significant figures (531.025)

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6
Q

what is accuracy

A

how close we are to actual value

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7
Q

what is precision

A

how close our measurements are to eachother

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8
Q

what is a false positive error

A

when we say that the null hypothesis is false but its true

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9
Q

what is a false negative

A

when we say the null hypothesis is true but it is actually false

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10
Q

when do we use comparing x to u

A

when we are analyzying the difference between our mean and the reference value

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11
Q

when do we use f test

A

when we are testing if the standard deviations/ variances are different between two things

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12
Q

when do we use a unpaired t test

A

when we are analyzing the means between two methods and assume the variance is equal (one is not better than the other) but we want to see if they provide the same mean values

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13
Q

when do we use a paired t test

A

when we assume the means are not comparable but we want to analyze the difference or variances in the two methods

may be helpful in determining if one method is better than other (has a stronger variance in one direction)

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14
Q

when can we assume that the activities are one?

A

when the ionic strength is really low. So if you have really low concentrations of something, you can probably assume that the activities are 1

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15
Q
A
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