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Lady_Fox [76]
3 years ago
8

A serological test is being devised to detect a hypothetical chronic disease. 500 individuals were referred to a laboratory for

testing. 300 diseased persons were among the 500. A serological test yielded 250 positives, of which 90% were true positives. Calculate the predictive value positive of the test.
Mathematics
1 answer:
andriy [413]3 years ago
7 0

Answer: the predictive value positive of the test is 0.7

Step-by-step explanation:

Given that;

                                              Predicted

                                             Diesease                No-Diesease                Tt

Actual              Diesease           225                           75                         300

No-Diesease         25                175                            200

                                                  250                           250                       500

so finding the predictive value positive of the test,

predictive negative value = (175 / (75+175) )

= 175 / 250

= 0.7

Therefore the predictive value positive of the test is 0.7

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The equation C = 20n + 35 represents the relationship between the cost of school volleyball uniforms, C, in dollars, and the num
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The equation represent a linear relation with the y-intercept

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Correct response:

1. 28 volleyball uniforms

2. Price per uniform

3. Initial flat order fee

4. 10 fewer volleyball uniform

<h3>Methods used for finding the above values</h3>

The given equation that represents the relationship between the cost of school volleyball uniform is; C = 20·n + 35

Where;

C = The uniform costs

n = The number of volleyball uniform ordered

The maximum amount the school has to spend = $600

1. The number of uniforms the school can buy is given by setting C = 600 as follows;

  • C = 20·n + 35

Therefore;

600 = 20·n + 35

20·n = 600 - 35 = 565

n = \dfrac{565}{20} = \mathbf{28.25}

Rounding down to the nearest whole number, we have;

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2. The number 20 represent the additional cost for each extra uniform, which is the unit cost therefore;

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3. The 35 in the equation represents an initial <u>flat fee</u>, such as an

ordering or initial fee, which is fixed.

Therefore;

  • The number 35 represent the <u>fixed cost </u>for producing the uniforms

4. The price per uniform of $30 changes the coefficient of <em>n</em> from 20 to 30 as follows;

C = 30·n + 35

The number of uniforms the school can by with $600 is therefore;

n = \dfrac{600 - 35}{30} = \mathbf{18.8 \overline 3}

Which gives;

The number of uniforms the school can purchase at $30 per uniform is n = 18 volleyball uniforms

The difference in the number of uniforms purchased = 28 - 18 = 10

Therefore;

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Learn more about linear equations here:

brainly.com/question/10452752

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Answer:

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Step-by-step explanation:

Given : a bus travel at 65 mph.

To find : How far does a bus travel in 2.5 hours.

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Speed of bus = 65 miles per hour.

Bus travel in 1 hour = 65 miles.

Bus travel in 2.5 hour = 2.5 * 65 miles .

Bus travel in 2.5 hour = 162.5 miles .

Therefore, Bus travel in 2.5 hour = 162.5 miles .

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