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kvasek [131]
3 years ago
8

Eric randomly surveyed 150 adults from a certain city and asked which team in a contest they were rooting​ for, either North Hig

h School or South High School. From the results of his​ survey, Eric obtained a​ 95% confidence interval of​ (0.52,0.68) for the proportion of all adults in the city rooting for North High. What proportion of the 150 adults in the survey said they were rooting for North High​ School?
A. 0.646

B. 0.60

C. Somewhere between 0.52 and 0.68, but the exact proportion cannot be determined.

D. This information cannot be determined from the information given in the problem
Mathematics
1 answer:
prohojiy [21]3 years ago
6 0

Answer:

B. 0.60

Step-by-step explanation:

Let be

X = adults in the survey said they were rooting for North High School

µ = mean

σ = standard deviation

let be

X1 = 0.52

X2 = 0.68

We know that a 95% confidence interval correspond to z values of -1.96 and 0.96

Now we have two equations to find µ and σ

-1.96 = (0.52 –µ)/σ  ….. equation 1

1.96 = (0.68 –µ)/σ   ….. equation 2

Dividing equation 1 and equation 2

-1.0 = (0.52 –µ)/ (0.68 –µ)

-1.0 (0.52 –µ) = (0.68 –µ)  

-0.52 + µ =0.68 - µ

µ + µ = 0.68 + 0.52

2 µ = 1.2

µ = 0.6

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UNO [17]
X + 3 (3) will be the answer
4 0
2 years ago
Please help explanation if possible
posledela

Answer:

y =3x - 5

Step-by-step explanation:

Well one of the way to do this question is the formula given below your question, but for me, i rather do it this way

OK they gave u y=3x - 12

And they say another line is parallel, once u see the word parallel means they have the same angle, same slope, same gradient ( sorry if I give u the wrong terms, since I learn mine in Malay)

So first u got to understand the slope-intercept form

y = mx + c

y is your y coordinate

x is your x coordinate

m is your gradient ( as in how much the line slants)

c is the y - intercept, as in, if u draw a graph, the y-coordinate where your line touches the y-axis (the vertical line)

So since the say the both lines are parallel, so both of their "m" is the same that is 3. Why? Cuz just compare

y = mx + c

y = 3x - 12

Therefore the m is 3

Therefore u alredy got your first value, so put it in your slope intercept form

y = mx + c

y = 3x + c

Now how to find c? Very easy, just put in the value of y and x from the coordinate ( that the line youre finding is on) they gave u, just put the value in

They gave u

(1, - 2)

So when x = 1, y = - 2

Therefore put it in

y = 3x + c

-2 = 3 (1) + c

c = - 5

Since now u have your m and c value, your slope intercept form is done, just put it in

y = mx + c

y = 3x + (-5)

y = 3x -5

6 0
2 years ago
The soccer field is 105 meters long. The football field is 120 yards long. Which is longer?
ASHA 777 [7]

The football field is longer than soccer field.

<h3>What is a expression? What is a mathematical equation? What is unit conversion?</h3>

A mathematical expression is made up of terms (constants and variables) separated by mathematical operators. A mathematical equation is used to equate two expressions. Equation modelling is the process of writing a mathematical verbal expression in the form of a mathematical expression for correct analysis, observations and results of the given problem. Conversion of units is the conversion between different units of measurement for the same quantity, typically through multiplicative conversion factors.

We have a soccer field that is 105 meters long and a football field is 120 yards long.

In one yard, we have -

1 yard = 0.9144 meters

Then, in 120 yards, we will have -

120 x 0.9144 = 109.728 meters

Now, 109.728 meters > 105 meters.

Therefore, the football field is longer than soccer field.

To solve more questions on dimensions and unit conversion, visit the link below -

brainly.com/question/4613077

#SPJ1

8 0
1 year ago
O panglica a fost taiata, prin 5 taieturi , in bucati cu lungimea de 35 cm . Cati metri masura panglica?
Amiraneli [1.4K]
35×5=175 (metri măsoară pamblica)

3 0
3 years ago
Help pleaseeeeeee!!!!!!
Archy [21]

Answer:

5x + 100

Step-by-step explanation:

(2x + 6) x 2 = 4x + 12

14x + 8 - 4x + 12 =

10x + 20 / 2 =

5x + 100

Hope that helps!

3 0
3 years ago
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