Solve *plz be quick*

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months. A random

enot [183]

Answer:

2995

Step-by-step explanation:

The first quartile (Q1) is defined as the middle number between the smallest number and the median of the data set

1127

1482

2995

3009

3250

3445

3449

4000

6120

rearranging the data sets from the least to the highest

the middle number of the data sets is 3250

the middle number between the smallest number and the median of the data set is 2995

7 0

3 years ago

Why will percent of change always be represented by a positive number?

Murljashka [212]

Percent of change will always be positive because the change is an absolute value. As we know, absolute value is always a positive value because you don't pay attention to the direction, only the distance is important.

3 0

3 years ago

What is the value of the expression below when x equals 5?

astraxan [27]

The answer is B.

14 + 15x
14 + 15(5)
14 + 75
89

7 0

3 years ago

Read 2 more answers

The value of y varies inversely as the square of x, and y = 16, when x = 3.

irina [24]

Answer:

The answer is

Step-by-step explanation:

The above variation is written as

$y = \frac{k}{ {x}^{2} }$

where k is the constant of variation

when y = 16

x = 3

k = yx²

k = 16(3)²

k = 16 × 9

k = 144

The formula for the variation is

$y = \frac{144}{ {x}^{2} }$

when y = 1

We have

$1 = \frac{144}{ {x}^{2} }$

Cross multiply

x² = 144

Find the square root of both sides

x = √144

x = 12

Hope this helps you

7 0

3 years ago

Gun ownership Concerned about recent incidence of gun violence, a public interest group conducts a poll of 850 randomly selected

denis23 [38]

Answer:

a.

The 95% confidence interval for the proportion of all American adults who have a gun in their home is (0.4066, 0.4734). This means that we are 95% sure that the true population proportions of American adults who have a gun in their home is between these two values.

b.

The confidence level is the probability of the confidence interval containing the population proportion.

Step-by-step explanation:

Question a:

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

Poll of 850 randomly selected American adults and finds that 44% of those surveyed have a gun in their home.

This means that $n = 850, \pi = 0.44$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.44 - 1.96\sqrt{\frac{0.44*0.56}{850}} = 0.4066$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.44 + 1.96\sqrt{\frac{0.44*0.56}{850}} = 0.4734$

The 95% confidence interval for the proportion of all American adults who have a gun in their home is (0.4066, 0.4734). This means that we are 95% sure that the true population proportions of American adults who have a gun in their home is between these two values.

b. Explain what is meant by 95% confidence in this context.

The confidence level is the probability of the confidence interval containing the population proportion.

5 0

3 years ago