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Sergio [31]
3 years ago
7

Steve will conduct a survey determine the number of times per year that people in the united states shop for clothing which samp

le should steve use to get results that are the most representative of the total population?
A: A random sample of 1000 people from 10 local clothing stores

B: A random sample of 1000 people from his city

C: A random sample of people from his state

D: A random sample of 1000 people from each of the 50 states
Mathematics
1 answer:
o-na [289]3 years ago
8 0

Answer: D: A random sample of 1000 people from each of the 50 states

Step-by-step explanation:

So to get the best results we want to eliminate as many sources of bias that we can so lets go through the answers

A: A: A random sample of 1000 people from 10 local clothing stores. This is bias because if we choose from people shopping at a store they might like to shop more than usual

B: A random sample of 1000 people from his city. This can't possibly represent all the people in the U.S. because the sample is only from his city so we can't choose this answer

C: A random sample of people from his state. Again this doesn't represent the U.S. and also we don't have a number for the sample size

D. D: A random sample of 1000 people from each of the 50 states. This answer is good because we have a sample size, its random, and it represents the 50 states

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A national survey showed that 44% of college students drink. A professor provided his own survey by choosing a random sample of
mamaluj [8]

Answer:

It is an unusual result contradicting the national survey.

Step-by-step explanation:

National survey showed 44% of college students who drink.

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4 0
3 years ago
(9x+2)(4x^2+35x-9)=0
pychu [463]
(9x+2)*(4x^2+35x-9)=0

we can make this...

9x+2=0

and

4x^2+35x-9=0

then...

9x+2=0

\boxed{x=-\frac{2}{9}}


4x^2+35x-9=0

x=\frac{-b\pm\sqrt{b^2-4*a*c}}{2*a}

x=\frac{-35\pm\sqrt{35^2-4*4*(-9)}}{2*4}

x=\frac{-35\pm\sqrt{1369}}{8}

x=\frac{-35\pm37}{8}

x_1=\frac{-35+37}{8}=\frac{1}{4}

x_2=\frac{-35-37}{8}=-9

\boxed{\boxed{S=\{\frac{1}{4},-\frac{2}{9},-9\}}}

I'm sure about my answer, don't matter the order...
4 0
3 years ago
Read 2 more answers
Help Pre-Calc
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Answer:

B) vertical stretch

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Given that the cost of manufacturing x refrigerators is given by the function f(x)= 2x^2 + 6000.

Now it says that the cost doubles for the year 2011 owing to higher raw material prices. So that means cost function will change from f(x) to 2f(x).

Now we need to decide the type of transformation from f(x) to 2f(x).

Remember that when f(x) changes to a*f(x) where value of "a" is greater than 1 then it stretches the function vertically by factor of "a".

in 2f(x), we have a=2

So that means "B) vertical stretch" is the correct choice.

6 0
3 years ago
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