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Wewaii [24]
3 years ago
10

The American Heart Association is about to conduct an anti-smoking campaign and wants to know the fraction of Americans over 46

who smoke.
Step 1 of 2: Suppose a sample of 2172 Americans over 46 is drawn. Of these people, 1738 don't smoke. Using the data, estimate the proportion of Americans over 46 who smoke. Enter your answer as a fraction or a decimal number rounded to three decimal places.
The American Heart Association is about to conduct an anti-smoking campaign and wants to know the fraction of Americans over 46 who smoke.
Step 2 of 2: Suppose a sample of 2172 Americans over 46 is drawn. Of these people, 1738 don't smoke. Using the data, construct the 98 % confidence interval for the population proportion of Americans over 46 who smoke. Round your answers to three decimal places
Mathematics
1 answer:
Luba_88 [7]3 years ago
6 0

Answer:

1.) .800

2.).779 to .821

Step-by-step explanation:

We must assume that the sample that we are given to work with is representative of the population, in which case we just need to find the proportion of people in the sample who don't smoke. This is \frac{1738}{2172} = .8002, or .800 rounded to three decimal places.

Part 2 will build off the answer in step 1. The middle of the confidence interval will be the estimate gained from the sample, or .800. The critical value of 98% equals 2.326 when using the normal model. The standard deviation can be calculated using the formula \sqrt{\frac{(proportion)(1-proportion)}{n} }. Plugging in the numbers you get \sqrt{\frac{(.8)(.2)}{2172} }= .009.

This means the confidence interval is .800±.021

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Step-by-step explanation:

5 0
3 years ago
Free pts!! Have a great day!
alukav5142 [94]

<em><u>Thanks !</u></em>

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4 0
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To anybody who is really good at math can you click on the image and answer the 4 questions please and thanks!
faltersainse [42]

Answer:

I did this erlier but...

1) Wallmart

2)16 Oz

3)You woluld save 7 cent per pound by choosing the 11 lbs turkey.

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Step-by-step explanation:

You divide the price by size.

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8 0
3 years ago
Which of the following describes the graph of y=\sqrt[3]{8x-64}-5 compared to the parent cube root function?
andriy [413]
Answer: stretched by a factor of 2 and translated 8 units right and 5 units down

Explanation:

These is the set of choices that accompany with this question:


<span>a) stretched by a factor of 2 and translated 64 units right and 5 units down
b) stretched by a factor of 8 and translated 8 units right and 5 units down
c) stretched by a factor of 2 and translated 8 units right and 5 units down
d) stretched by a factor of 8 and translated 64 units right and 5 units down


Solution:

</span>Let's work a little the given function to compare it with the parent function.

1) The given function is y = ∛[8x - 64] - 5

2) Extract common factor 8 of the expression inside the square brackets:

y = ∛[ 8( x - 8) ] - 5

3) Extract 8 from the root:

y = 2∛(x - 8) - 5

4) The parent function is ∛x. Call the parent function g(x) => g(x) = ∛x

5) Compare: y is 2 * g(x - 8) - 5

6) Analyze the meaning of that:

g(x - 8) means that the graph of the function is translated 8 units to the right

scaling by 2 means that the graph is stretch vertically (by a scale factor of 2)

- 5 means that the entire graph is shifted 5 units downward.

So, the description of the graph y = ∛(8x - 64) - 5 compared to the parent cube root function is: stretched by a factor of 2 and translated 8 units right and 5 units down


5 0
4 years ago
Read 2 more answers
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kari74 [83]

Answer:

$9,000

Step-by-step explanation:

$16,000 + $2,000 = $18,000

$18,000/2 = $9,000

I think this is correct but I'm not sure.

4 0
3 years ago
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