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kolbaska11 [484]

3 years ago

5

The city of Raleigh has 6200 registered voters. There are two candidates for city council in an upcoming election: Brown and Fel

iz. The day before the election, a telephone poll of 250 randomly selected registered voters was conducted. 86 said they'd vote for Brown, 160 said they'd vote for Feliz, and 4 were undecided. Describe the target population for this survey. i. All citizens of Raleigh ii. All registered voters in Raleigh iii. All registered voters with telephones in Raleigh iv. The 250 voters surveyed v. The 86 voters who said they'd vote for Brown vi. None of the above

2 answers:

Vadim26 [7]3 years ago

8 0

Answer:

B) All registered voters in Raleigh

i THIINNKK im not sure

Step-by-step explanation:

baherus [9]3 years ago

3 0

By smoking hypotenuse

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Which expression is equivalent to 3\dfrac78 - 6\dfrac143 8 7 −6 4 1 3, start fraction, 7, divided by, 8, end fraction, minus

Sophie [7]

Answer:

$-2\dfrac{3}{8}$

Step-by-step explanation:

Given the expression:

$3\dfrac78 - 6\dfrac14$

We are to simplify and obtain an equivalent expression.

Step 1: Change to Improper Fractions

$3\dfrac78 - 6\dfrac14=\dfrac{31}{8}-\dfrac{25}{4}$

Step 2: Take the Lowest Common multiple of the denominators

LCM of 8 and 4 is 8.

Therefore:

$\dfrac{31}{8}-\dfrac{25}{4}=\dfrac{31-2(25)}{8}\\\\\dfrac{31-50)}{8}\\\\=-\dfrac{19}{8}\\\\=-2\dfrac{3}{8}$

Therefore, an equivalent expression to $3\dfrac78 - 6\dfrac14$ is $-2\dfrac{3}{8}$ .

6 0

3 years ago

Read 2 more answers

A quality control expert wants to estimate the proportion of defective components that are being manufactured by his company. A

tigry1 [53]

Answer:

A sample of 1032 is needed.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

A sample of 300 components showed that 20 were defective.

This means that $\pi = \frac{20}{300} = 0.0667$

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

How large a sample is needed to estimate the true proportion of defective components to within 2.5 percentage points with 99% confidence?

A sample of n is needed.

n is found when M = 0.025. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.025 = 2.575\sqrt{\frac{0.0667*0.9333}{n}}$

$0.02\sqrt{n} = 2.575\sqrt{0.0667*0.9333}$

$\sqrt{n} = \frac{2.575\sqrt{0.0667*0.9333}}{0.02}$

$(\sqrt{n})^2 = (\frac{2.575\sqrt{0.0667*0.9333}}{0.02})^2$

$n = 1031.9$

Rounding up

A sample of 1032 is needed.

6 0

3 years ago

Let f(x) = 1/x and g(x) = x^2 + 4x. What<br> two numbers are not in the domain of fºg?

Ne4ueva [31]

Answer:

0 and -4

Step-by-step explanation:

We have been given the following functions;

f(x) = 1/x

g(x) = x^2 + 4x

The first step would be to evaluate the composite function fºg.

fºg = f[g(x)]. We substitute g(x) in place of x in f(x)

fºg = $\frac{1}{g(x)}=\frac{1}{x^{2}+4x}$

This is clearly a rational function which will be defined everywhere except where the expression in the denominator will be equal to 0.

We solve for x;

$x^{2}+4x=0\\\\x(x+4)=0\\x=0\\x=-4$

Therefore, the two numbers that are not in the domain of fºg are 0 and -4

6 0

4 years ago

Read 2 more answers

HELPPPP The volume for the above figure is

MissTica

D) none of the above

6 0

2 years ago

What is - 1.8 = h - 4.7?

White raven [17]

The answer is h= 2.9
steps:
-1.8 = h-4.7
+4.7 +4.7
2.9 = h

7 0

3 years ago

Read 2 more answers