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blagie [28]
3 years ago
6

In a random poll taken in 2008, Gallup asked 1006 national adults whether they were baseball fans. 433 of the sample said they w

ere. Construct a 95% confidence interval to estimate the proportion of national adults who are baseball fans.
Mathematics
1 answer:
nexus9112 [7]3 years ago
6 0

Answer:

Step-by-step explanation:

i don't know

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Allie has 3 pairs of white socks, 5 pairs of blue socks, and 2 pairs of pink socks. Wade has 8 pairs of white socks, 1 pair of b
Helen [10]
3 more. The color doesn't matter at all. It's all about the amount.

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3 years ago
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In selecting a sulfur concrete for roadway construction in regions that experience heavy frost, it is important that the chosen
Lesechka [4]

Step-by-step explanation:

Given - In selecting a sulfur concrete for roadway construction in regions that experience heavy frost, it is important that the chosen concrete has a low value of thermal conductivity in order to minimize subsequent damage due to changing temperatures. Suppose two types of concrete, a graded aggregate and a no-fines aggregate, are being considered for a certain road. The table below summarizes data on thermal conductivity from an experiment carried out to compare the two types of concrete.

Type            ni                xi                  si

Graded       42           0.486            0.187

No-fines      42           0.359           0.158

To find - a. Formulate the above in terms of a hypothesis testing problem.

b. Give the test statistic and its reference distribution (under the null hypothesis).

c. Report the p-value of the test statistic and use it to assess the evidence that this sample provides on the scientific question of difference in mean conductivity of the two materials at the 5% level of significance.

Proof -

a.)

Hypothesis testing problem :

H0 : There is significant difference between mean conductivity for the graded concrete and mean conductivity for the no fines concrete.

H1 : There is no significant difference between mean conductivity for the graded concrete and mean conductivity for the no fines concrete.

b)

Test statistic :

Z = \frac{x_{1} - x_{2} }{\sqrt{\frac{s_{1} ^{2} }{n_{1}}  + \frac{s_{2}^{2} }{n_{2}} } }

Z = \frac{0.486 - 0.359 }{\sqrt{\frac{0.03496 }{42}  + \frac{0.02496 }{42} } }

Z = \frac{0.127 }{\sqrt{0.001468}}

Z = \frac{0.127 }{0.0377}

⇒Z(cal) = 3.3687

Z(tab) = 1.96

As Z (cal) > Z(tab)

So, we reject H0 at 5% Level of significance

p-value = 0.99962

Hence

There is significant difference in mean conductivity at the two materials.

5 0
2 years ago
Without graphing, is the system independent, dependent, inconsistent? {12x=3y=12 y=-4x+5
Alla [95]
Okay so you out them into the form of y=mx+b. since equation 2 is already like that you need to do it to equation 1. which is y=-4x+4. graph both equations. if it has a solution (1 point where the two lines meet) it is consistantly and independent. if they are parallel lines and the solution is 0 the system is inconsistent and the lines are dependent. if it's the same line they are consistent and dependent. the line is not the same since the y intercept is different. the slope is the same though which tells us its parallel. so the system has a solution of 0 and is inconsistent and the lines are independent.
7 0
3 years ago
Please answer this its in the picture
Basile [38]

The correct answer is

2 cents.

4 0
2 years ago
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7/10 + 2/10 , 13/16+ 2/16 , 4/5 + 1/5 , 7/15 + 2/15 , 9/20 + 3/20 , 5/8 + 1/8 . All in simplist form.
blondinia [14]

Hello!

<h3><em><u>Answers</u></em></h3>

1. \frac{7}{10} + \frac{2}{10} = \frac{9}{10}  Simplest form: \frac{9}{10}

2. \frac{13}{16} + \frac{2}{16} = \frac{15}{16}  Simplest form: \frac{15}{16}

3. \frac{4}{5} + \frac{1}{5} = \frac{5}{5}  Simplest form: \frac{1}{1}

4. \frac{7}{15} + \frac{2}{15} = \frac{9}{15}  Simplest form: \frac{3}{5}

5. \frac{9}{20} + \frac{3}{20} = \frac{12}{20}  Simplest form: \frac{3}{5}

6. \frac{5}{8} + \frac{1}{8} = \frac{6}{8}  Simplest form: \frac{3}{4}

<h3><em><u>Explanation:</u></em></h3>

Simply add the numerators of the like fractions together. The denominators remain the same.

4 0
3 years ago
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