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mestny [16]
3 years ago
10

A study wanted to assess the accuracy of self-reported smoking status. Participants are asked whether they currently smoke or no

t. In addition, laboratory tests are performed on hair samples to determine presence or absence of nicotine. The laboratory assessment is considered the gold standard, or truth about nicotine. The data are as follows.
(a) What is the sensitivity of the self-reported smoking status?
(b) What is the specificity of the self-reported smoking status?

Nicotine absent Nicotine present
Self-reported nonsmoker 82 14
Self-reported smoker 12 52
Mathematics
1 answer:
HACTEHA [7]3 years ago
4 0

Answer: a) 0.7878, b) 0.8723

Step-by-step explanation:

Since we have given that

                                              Nicotine present      Nicotine absent

Self-reported non smoker                  82                                      14

Self-reported smoker                          12                                      52

(a) What is the sensitivity of the self-reported smoking status?

P(smoker|Nicotine\ present)=\dfrac{52}{52+14}=\dfrac{52}{66}=0.7878

(b) What is the specificity of the self-reported smoking status?

P(Non-smoker|Nicotine\ absent}=\dfrac{82}{82+12}=\dfrac{82}{94}=0.8723

Hence, a) 0.7878, b) 0.8723

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An artist is creating a large conical sculpture for a park. The cone has a height of 16 m of and a diameter of 25 m. Find the vo
alexdok [17]

Answer:

The answer is B.

Step-by-step explanation:

A=3.14 x 12.5>2

A= 3.14 x 156.25 =490-.625

A= 490.625 x 16m

A= 7, 850 m3

7 0
3 years ago
Damaged items are marked down 25% to 40%. A newspaper coupon holder; to an additional 10% markdown of the new price due to the d
kobusy [5.1K]

Answer:

B. GHC 50.00

Step-by-step explanation:

The given parameters are;

The percentage by which damaged items are marked down = 25% to 40%

The percentage markdown offered by the newspaper coupon = 10%

The original marked price of the item = GHC 100

We note that a markdown is the difference between the price an item is placed at for retail sale, and the actual price the item is sold

Given that the item is damaged, to have the lowest price, we apply the largest markdown of 40% as follows;

Price of item marked down due to damage, we remove 40% from the price to get;

The markdown due to damage = 40/100 × GHC 100 = GHC 40

The markdown the coupon holder is to get = 10% of the retail price

Given that the damage is not mentioned in the newspaper, we have;

∴ The markdown the coupon holder is to get = 10/100 × GHC 100 = GHC 10

The total markdown is therefore equal to GHC 40 + GHC 10 = GHC 50

Therefore;

The lowest price of the item = Original price - Maximum markdown

The lowest price of the item = GHC 100 - GHC 50 = GHC 50

Learn more about markdown here;

brainly.com/question/20705786

5 0
2 years ago
Please solve this for me
atroni [7]

Answer: $800 because if you have a light that is $2,000 and it loses %10 of its price per month, and June is 4 months away, then it is only $800.

4 x .1 = .4 so $2,000 x .4 = $800

5 0
3 years ago
Hi, I’m really struggling with this problem and would love some help!
sergiy2304 [10]
Answer and work down below

7 0
3 years ago
ace bike rentals rents bikes for $28 per day. Renters can keep the bike for 8 hours. Bart's bikes rents bikes for $30 per day. R
lyudmila [28]

Bart company charges a lower rate. It is lower by rate $ 0.5 per hour

<h3><u>Solution:</u></h3>

Given that Ace bike rentals rents bikes for $28 per day. Renters can keep the bike for 8 hours

Also given that Bart's bikes rents bikes for $30 per day. Renters can keep the bike for 10 hours

To find: company that charges lower rate

Let us find the hourly rate of Ace and Bart

\text {hourly rate }=\frac{\text { Rental price }}{\text { total time in a day }}

<em><u>Hourly rate of Ace company:</u></em>

Rental price = $28

total time in a day 8 hours

\text {hourly rate }=\frac{28}{8}=3.5

So the hourly rate of Ace company is $ 3.5 per hour

<em><u>Hourly rate of Bart company:</u></em>

Rental price = $ 30

total time in a day 10 hours

\text {hourly rate }=\frac{30}{10}=3

So the hourly rate of Bart company is $ 3 per hour

<em><u>Comparing hourly rate of both companies</u></em>

Ace company is $ 3.5 per hour

Bart company is $ 3 per hour

Bart company < Ace company

3 < 3.5

Thus bart company charges a lower rate

<h3><em><u>How much lower?</u></em></h3>

hourly rate of Ace company - hourly rate of Bart company = 3.5 - 3 = 0.5

So, it is lower by rate $0.5 per hour

6 0
3 years ago
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