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vovikov84 [41]
3 years ago
7

A researcher wishes to estimate the proportion of all adults who own a cell phone. he takes a random sample of 1,572 adults; 1,2

98 of them own a cell phone, hence 1298∕1572 ≈ .83 or about 83% own a cell phone. what is the population of interest? what is the parameter of interest? what is the statistic involved? based on this sample, do we know the proportion of all adults who own a cell phone? explain fully.
Mathematics
1 answer:
zhuklara [117]3 years ago
8 0

solution:

a) The population of interest is all the adults

b) The parameter of interest is p, the proportion of adults who own a cell phone

c) The statistic is the proportion, p^, of the sample of 1572 adults who own a cell phone. The value of the sample proportion is 0.83.

d) We dont the the exact proportion with 100 % but we know that the proportion would lie in a certain range with certain degree of confidence


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Jessica and Josh are selling Entertainment Books to raise money for the art room at their school. One book sells for $15. Jessic
melisa1 [442]
<h2><u>Answer</u><u>:</u><u>-</u></h2>

Jessica sells = 240 books,

Josh sells = 16 books.

<h3>Given:-</h3>

The price of one book is = $15

Jessica sold 15 times more books than Josh.

In total, they have sold 256 books.

<h3>Solution:-</h3>

We can easily find the answer using variables.

Let,

Josh sold a total of x books whereas Jessica sold a total number of 15x books.

together they sold 16x books.

So we can form the equation

16x= 256

by solving this equation we will get x=16

So, Josh sold 16 books and Jessica sold 16×15=240 books in total.

5 0
2 years ago
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What is the slope of the line that passing through (-2, 4) and the origin.
S_A_V [24]

Answer:

slope= -2

Step-by-step explanation:

using \frac{y2-y1}{x2-x1} you plug in the values of (-2,4) and (0,0)

=\frac{0-4}{0-(-2)}

=\frac{-4}{2}

= -2

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3 years ago
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How to simplify -3 (4×-5y-5×)
Phoenix [80]
-12x + 15y + 15x
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In Andrew’s Furniture Shop, he builds bookshelves and tables. Each type of furniture takes him about the same time to make. He f
Paul [167]
A. You may set the variables in either order. But for argument sake, let's set as follows:

x = Amount of bookshelves
y = Amount of tables

B. Because of the amount of things you need to make, the following is an inequality using those variables.

x + y > 25

Plus you can determine a second inequality based on the amount of money that you have to spend. 

20x + 45y < 675

Finally you may also add in that each value must be greater than or equal to zero, since they cannot have negative tables. 

C. By solving the system and looking at basic constraints when graphed, you can see the feasible region has 4 vertices. 

(0,0)
(18, 7)
(0, 15)
(33.75, 0) or (33, 0) if you insist on rounding. 
8 0
3 years ago
Help
Lubov Fominskaja [6]

Answer:

x=5

Step-by-step explanation:

(8x-8)3/2=64

(24x-8)/2=64 -You are distributing the three

12x-4=64 -You divide the whole thing by two

12x=60 -You subtract the four from both sides

x=5 - You divided the twelve from both sides

Hope this helps!

7 0
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