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ra1l [238]
3 years ago
5

A study of six hundred adults found that the number of hours they spend on social networking sites each week is normally distrib

uted with a mean of 17 hours. the population standard deviation is 6 hours. what is the margin of error for a 95% confidence interval? 0.134 0.220 0.313 0.480
Mathematics
2 answers:
MissTica3 years ago
8 0

Answer:

0.48

Step-by-step explanation:

Given : Mean = 17 hours

            Standard deviation = 6 hours

            n = population size =600

To Find: what is the margin of error for a 95% confidence interval?

Solution:

n= 600

\sigma = 6

z = 1.96 for a 95 % confidence interval;

Margin of error formula:

ME=\frac{z \times \sigma}{\sqrt{n}}

Substitute the values

ME=\frac{1.96 \times 6}{\sqrt{600}}

ME=0.48

Hence the margin of error for a 95% confidence interval is 0.48

babymother [125]3 years ago
4 0
The answer is C. 0.313
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M= -5, point: (7.1.–6.5)<br> Equation of line
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Answer:

y + 6.5  =-5 (x - 7.1)

Step-by-step explanation:

We can use the point slope equation of a line

y -y1 = m(x-x1)

We have a point and a slope

y - - 6.5 = -5 (x - 7.1)

y + 6.5  =-5 (x - 7.1)

8 0
3 years ago
On average the number of electric guitars sold in New York each year is 88,438, which is seven times the average number of elect
Taya2010 [7]

Answer:

South Dakota sells 12634 electric guitars p/yr.

Step-by-step explanation:

All you have to do is divide 88,438 by 7 because New York sells 7 times more. Divide that by 7 and you get 12,634

In Conclusion, your answer is that South Dakota sells 12634 electric guitars p/yr (per year) on average.

8 0
3 years ago
Question one answer?
Elis [28]
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7 0
3 years ago
3. List the angles of the triangle in order from smallest to largest.
Veseljchak [2.6K]

Answer:

The list of angles of the triangle in order from smallest to largest will be: A < C < B

Hence, option 'e' is true.

i.e (A,C,B)

Step-by-step explanation:

We know that in a triangle the greater angle has the longer side opposite to it.

From the given triangle,

Side AC = 7.2 is the longer side. Thus, B is the largest angle as it is opposite to the longer side AC = 7.2.

Then comes the second-longest side AB=4.9. Thus, C is the 2nd largest angle it is opposite to the second-longest side AB=4.9.

Finally comes the shortest side BC = 3.2. Thus, A is the shortest angle as it is opposite to the shortest side BC = 3.2.

Thus, the list of angles of the triangle in order from smallest to largest will be: A < C < B

Hence, option 'e' is true.

i.e (A,C,B)

6 0
3 years ago
A magic carpet is made with three different colors of yarn. The ratio of each color is shown below. 10 parts gold yarn, 7 parts
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Answer: 22.5 yards

Step-by-step explanation:

There are a total of 20 parts yarn. This means that 3/20 of the carpet is silver. So in order to compare this to the 150 meters of total yarn, you would set up this equation:

3/20 = x/150

Next, you cross multiply:

3*150 = 20*x or simplified would be 450 = 20x

Next, you divide both sides by 20 to get x by itself.

450/20 = 22.5, so x is equal to 22.5

This means you have 22.5 yards of silver in the carpet.

7 0
3 years ago
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