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1 year ago

I am stuck here plz help I am so sick of this question

Mathematics

2 answers:

Damm [24]1 year ago

8 0

Answer:

(1,22)

(4,10)

(5,6)

(6,2)

Step-by-step explanation:

Dovator [93]1 year ago

3 0

Answer:

the first two are correct

the other two boxes, in order are: 6, 2

Step-by-step explanation:

you just have to substitute x into the equation, so when it says x is 1, you substitute 1 into the equation given, in this case it's y = 26 - 4x. After that, you just do regular math to get your y value

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Can the division expression 4 divided by 15 be shown as a fraction?

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The lines on a 2 cup liquid measuring cup divide each cup into eighths. If you measure 1 cups of water, between

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The 4rth line and 5th line

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7th line ------

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3 years ago

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Evaluate 12x−3y when x=−14 and y=3

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2 years ago

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A line has slope −34 and y–intercept 5. Which answer is the equation of the line? y=−5x+34 y=−34x+5 y=34x−5 y=5x−34?

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2 years ago

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A new screening test for Lyme disease is developed for use in the general population. The sensitivity and specificity of the new

Anit [1.1K]

Answer:

predictive value of a positive test = 18.18%

predictive value of a negative test = 94.03%

Step-by-step explanation:

Sensitivity = 60% = 0.6

Specificity = 70% = 0.7

Let True Positive = TP

True Negative = TN

False Negative = FN

$Sensitivity = \frac{TP}{TP + FN} \\0.6 = \frac{TP}{TP + FN} \\0.6TP + 0.6FN = TP\\0.4TP = 0.6FN\\TP = 1.5 FN$

$Specificity = \frac{TN}{TN + FP} \\0.7 = \frac{TN}{TN + FP} \\0.7TN + 0.7FP = TN\\0.7FP = 0.3 TN\\TN = 7/3 FP$

Prevalence = 10% = 0.1

Three hundred people are screened, $T_{total} = 300$

Total number of people having the disease, $T_{disease} = ?$

$Prevalence = \frac{T_{disease} }{T_{total} } \\0.1 = \frac{T_{disease} }{300 }\\T_{disease} = 30$

$T_{disease} = TP + FN\\30 = TP + FN$

But TP = 1.5 FN

30 = 1.5 FN + FN

30 = 2.5 FN

FN = 30/2.5

FN = 12

TP = 1.5 FN = 1.5 * 12

TP = 18

$FP + TN = T_{total} - T_{disease} \\FP + TN = 300 - 30\\FP + TN = 270\\FP + \frac{7}{3} FP = 270\\\frac{10}{3} FP = 270\\FP = 27 * 3\\FP = 81$

81 + TN = 270

TN = 189

To calculate the Predictive value of positive test (PPT)

$PPT = \frac{TP}{TP + FP} * 100\\PPT = \frac{18}{18+81} * 100\\PPT = \frac{18}{99} * 100\\PPT = 18.18 \%$

To calculate the Predictive value of negative test (PNT)

$PPT = \frac{TN}{FN + TN} * 100\\PPT = \frac{189}{189+12} * 100\\PPT = \frac{189}{201} * 100\\PPT = 94.03 \%$

7 0

2 years ago