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4 years ago

The following set of coordinates represents which figure?

Mathematics

1 answer:

timurjin [86]4 years ago

7 0

The following coordinates represent a parallelogram.

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In a recent poll of 760 homeowners in the United States, one in five homeowners reports having a home equity loan that or she is

Mkey [24]

Answer:

The 90% confidence interval for the proportion of all homeowners in the United States that hold a home equity loan is (0.176, 0.224)

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 $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

$n = 760, \pi = \frac{1}{5} = 0.2$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.2 - 1.645\sqrt{\frac{0.2*0.8}{760}} = 0.176$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.2 + 1.645\sqrt{\frac{0.2*0.8}{760}} = 0.224$

The 90% confidence interval for the proportion of all homeowners in the United States that hold a home equity loan is (0.176, 0.224)

5 0

3 years ago

Very easy!! help!! urgent!! its on ratio

masha68 [24]

Answer:

A and B are correct

Step-by-step explanation:

if x:y is 1:3 then x is 1 and y is 3

1/3 of 3 is 1 so A is correct

3/4(1+3) is 3 so B is correct

But

1/4 × 3 is not 1 so C is not correct

3/4 ×1 is not 3 so D isn't correct

5 0

3 years ago

Macy's is having a Fall sale where everything is 30% off. Angela has a coupon for an additional 10%

givi [52]

Answer:

$113.40

Step-by-step explanation:

The dress is $180 subtracted by 30% ($54) and is now $126

$126 - 10% which is $12.60 and is now $113.40

5 0

3 years ago

What 2 whole numbers would the fraction 9/4 fall between?

sammy [17]

Answer:

2 and 3

Step-by-step explanation:

9/4=2.25

6 0

4 years ago

In a study of variation in systolic blood pressure upon application of leaches, it is found that the standard deviation of the 2

kondor19780726 [428]

Answer:

Test statistic is [(n - 1) *S^2 ]/ σ ^2 = [(22 - 1) *(3.9)^2 ]/ (3.4) ^2

with 21 degrees of freedom

Yes this data fits at the 10% level of significance, so I would not reject that statistic of 3.9 mmHg as a wrong standard deviation

Step-by-step explanation:

use the expression I attached in the image to find

[(n - 1) *S^2 ]/ σ ^2

where S = the standard deviation calculated from the sample of n trials.

sigma is the population standard deviation.

[(22 - 1) *(3.9)^2 ]/ (3.4) ^2 = 21 * 15.21 / 11.56 = 27.6306

all we have to do now is to make sure this number is in the 90 % confidence

interval. remember this has 21 degrees of freedom, look at the chi-squared chart.

11.5913 < 27.6306 < 32.67905

where 11.5913 is the lower bound of the chart

and 32.67905 is the upper bound

6 0

3 years ago