In a sample of 41 water specimens taken from a construction site, 23 contained detectable levels of lead.

A 95% confidence interval for the proportion of water specimens that contain detectable levels of lead is 0.409


Required:
Construct a confidence interval for the proportion of water specimens that contain detectable levels of lead.

Answers

Answer 1

Answer:

drippy pen iss

Step-by-step explanation:


Related Questions

I WILL MARK BRAINLEST!!! FOR YOU CAN ANSWER THESE TWO

Answers

Answer:

First question: 1.4

Second question: Option 3

Step-by-step explanation:

First question:

You simplify the left equation first,

-0.4 x -3.5 = 1.4 , -0.4 x 2.9 = -1.16

1.4k - 1.16

For this to equal the right equation, the number missing must be 1.4.

Second question:

You simplify the equation given to you first,

1/4 x 8 = 2 , 1/4 x 12 = 3

2x + 3

The option that is equivalent to the answer is option 3; 2x + 3

On holidays three friends decided to buy a Christmas tree for $96. They made a cash contribution of 3: 5: 8. The two friends who invested less decided to return the third friend's money so that their cash contributions became the same. What is the ratio of the money returned by the first person to the money returned by the second person?

Answers

Answer:

7 : 1

Step-by-step explanation:

Total money = $96Contribution ratio = 3 : 5 : 8

Contribution by each:

3x + 5x + 8x = 9616x = 96x = 63x → $18, 5x → $30, 8x → $48

Equal contribution is:

$96/3= $32

Returned by first and second person:

$32 - $18 = $14$32 - $30 = $2

Ratio of returned amount:

14 : 2 = 7 : 1

Use the drop-down menus to label the points on the number line.

Answers

Answer:

Step-by-Use the drop-down menus to label the points on the number line.

Point A is at . - 1 2/4

Point B is at . - 3/4

Point C is at 3/4.    

Point D is at  explanation:1 3/4

The position of the points A, B, C, and D on the number line will be –3/2, –3/4, 3/4, and 7/4.

What is coordinate geometry?

Coordinate geometry is the study of geometry using the points in space.

The number line is shown below.

From the figure, we can observe that there are 4 sections between each successive numbers.

The point A is at –1 2/4 that is –3/2.

The point B is at –3/4.

Then the point C is at 3/4.

And the point D is at 1 3/4 that is 7/4.

More about the coordinate geometry link is given below.

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Scott likes to run long distances. He can run 20 \text{ km}20 km20, start text, space, k, m, end text in 858585 minutes. He wants to know how many minutes (m)(m)left parenthesis, m, right parenthesis it will take him to run 52 \text{ km}52 km52, start text, space, k, m, end text at the same pace.
How long will it take Scott to run 52 \text{ km}52 km52, start text, space, k, m, end text?
minutes

Answers

Answer:

Scott will take 221 minutes to run 52 km

Step-by-step explanation:

Speed

The speed of an object can be calculated with the formula:

[tex]\displaystyle v=\frac{d}{t}[/tex]

Where d is the distance traveled and t is the time taken.

Scott can run d=20 km in 85 minutes. Thus, his speed is:

[tex]\displaystyle v=\frac{20}{85}\ km/min[/tex]

Now he wants to know how many minutes it will take him to run d=52 km. Solving the formula for t:

[tex]\displaystyle t=\frac{d}{v}[/tex]

Since the speed has been already determined:

[tex]\displaystyle t=\frac{52}{\frac{20}{85}}[/tex]

Multiplying by the reciprocal of the denominator:

[tex]\displaystyle t=52*\frac{85}{20}[/tex]

t = 221 min

Scott will take 221 minutes to run 52 km

Answer:

221 min

Step-by-step explanation:

eligible on khan academy

Kyra opened a nail salon. For each manicure, Kyra charges $12. This week, Kyra has a goal of making a total of $200. Write an inequality that shows the minimum number of manicures that Kyra will need to give in order to meet her goal.​

Answers

im pretty sure its 12m<200 but its the less than sign with a line under it (im on phone so i cant type it)

3) The mean of a set of data is 4.68 and its standard deviation is 2.83. Find the z score for a value of 9.38.

Answers

Answer:

1.66

Step-by-step explanation:

The mean of a set of data is 4.68 and its standard deviation is 2.83. Find the z score for a value of 9.38

Given that :

Mean (m) = 4.68

Standard deviation (s) = 2.83

Value of x = 9.38

Zscore = (x - mean) / standard deviation

Zscore = (9.38 - 4.68) / 2.83

Zscore = 4.7 / 2.83

Zscore = 1.6607773

Hence, Zscore for a value of 9.38 is 1.66

The table shows data collected from 14 people. Shoe Size, x 8.5 9 9 9.5 10 10 10.5 10.5 11 11 11 12 12 12.5 Height (inches), y 66 68.5 67.5 70 70 72 71.5 70 71 71.5 73 73.5 74 74 Determine the correlation coefficient for the data. Round to the nearest hundredth.

Answers

Answer:

0.9266

Step-by-step explanation:

Given the data:

Shoe size x :

8.5

9

9

9.5

10

10

10.5

10.5

11

11

11

12

12

12.5

Height y :

66

68.5

67.5

70

70

72

71.5

70

71

71.5

73

73.5

74

74

The correlation Coefficient obtained from the online Coefficient of regression calculator is 0.9266 which depicts a strong positive relationship between shoe size and height

The correlation coefficient for the data is 0.93 and this can be determined by using the formula of the correlation coefficient.

Given :

The table shows data collected from 14 people.

A statistical measure of the strength of the relative movement between two variables is known as the correlation coefficient.

The formula of the correlation coefficient is given by:

[tex]\rm r = \dfrac{\sum (x_i-\bar{x})(y_i-\bar{y})}{\sqrt{\sum(x_i-\bar{x})^2\sum(y_i-\bar{y})^2} }[/tex]

where r is the correlation coefficient, [tex]\bar{x}[/tex] is the mean of the values of the x variable, [tex]x_i[/tex] values of the x-variable in the sample space, [tex]y_i[/tex] values of the y-variable in a sample space, and [tex]\bar{y}[/tex] is the mean of the values of the y-variable.

Now, from the attached table substitute the values of the known terms in the above formula.

[tex]\rm r = \dfrac{35.4464286}{\sqrt{(19.23214289)\times (76.08928571)} }[/tex]

Simplify the above expression.

[tex]\rm r = \dfrac{35.4464286}{38.25388889} }[/tex]

r = 0.93

So, the correlation coefficient for the data is 0.93.

For more information, refer to the link given below:

https://brainly.com/question/17716064

= 3x + 4, what is y when x is 1, 2, and 3

Answers

Answer:

when x is 1 y is 7

when x is 2 y is 10

when x is 3 y is 13

Step-by-step explanation:

1 point
19. Write the equation for this line in slope-intercept form. (y=mx+b)*

Answers

Answer:

y=-4x+5...

Step-by-step explanation:

y=-4x+5...

any gymnast or cheerleader

Answers

Answer:

Cheerleader :))

Step-by-step explanation:

Nopeeeeeeeeeeeeeeeeeeeeee

In every right triangle there is exactly one ____.

Answers

Answer:

point

Step-by-step explanation:

Answer:

90 degree angle

Step-by-step explanation:

Rate me also give advice
No i am not growing out my hair it looks worse
My skin we clear in next few months currently taking Accutane
Contacts are not a option
.

Answers

Answer:

You look very nice!

Step-by-step explanation:

it matters what you look like to yourself not how you look to others!

What numerical coefficient of b on the right side of the equation makes the expressions equivalent? -3(-5b + 6) b-2​

Answers

Answer:

-5

Step-by-step explanation:

coefficient of b is -5

What percentage of the food cost is the tip?

Answers

In the US, a tip of 15% of the before tax meal price is typically expected.

6/7 × 1/2 = ? Question 29 options: 37 127 27 314

Answers

6/7 x 1/2 = 6x1/7x2 = 6 / 14 = 3/7

Answer is 3/7

Y/9 + 5 = 0 ???????????

Answers

Answer:

[tex]y=-45[/tex]

Step-by-step explanation:

[tex]\frac{y}{9}+5=0[/tex]

[tex]\frac{y}{9}=-5[/tex]

[tex]y=-45[/tex]

In Mona’s new video game she earns 30 points for each fish caught and 80 points for each octopus captured, but she loses 15 points every time she captures a crab. Which expression represents the total number of points Mona will earn if she catches x fish, y octopi, and z crabs?
95 (x + y minus z)
110 (x + y) minus 15 z
30 x + 80 y minus 15 z
30 + x + 80 + y minus 15 + z

Answers

Answer:

c. 30x+80y-15z.

Step-by-step explanation:

Answer:

CCCCCCCCCCCC

Step-by-step explanation:

(2x-40)° = (x+10)° solve for x

Answers

Answer:

X = 50

Step-by-step explanation:

2x-x = 40 + 10

X =50

Take the x to be on the same sides and the normal numbers in the other side. Then work them out.

please help i have 1 hour to complete this

Answers

Answer:

for the first one its C,D and E

but for the second one i dont

know so sorry

Step-by-step explanation:

explanation pleasee!

Answers

Step-by-step explanation:

Triangles ABC and DEF are congruent.

The letter B is the 2nd letter in 'ABC'.

Likewise, the letter E is the 2nd letter in 'DEF'.

Therefore Angle B = Angle E.



- World population in 2014 was estimated to have been 89614160,express it into billions​

Answers

Answer:

Im a little confused what this question is asking, but the number in billions is simply 89.61416 if the original number is in thousands! Hope that helps and if that was not what you were looking for, let me know. :)

Step-by-step explanation:

Answer:

It is estimated that the population of the world reached one billion for the first time in 1804. It was another 123 years before it reached two billion in 1927, but it took only 33 years to rise by another billion people, reaching three billion in 1960.

PLZ RESPOND ASAP! 50 POINTS
classify which numbers are rational or irrational


The given numbers are:
5/4
√100
7.3
0.00247
√4/9
√2/24
0.01 with the line above the 1

Answers

Answer:

5/4 = rational   √100 = rational 7.3 =rational 0.00247 = rational √4/9 = irrational √2/24 = irrational 0.01 (with the line) = irrational

Step-by-step explanation:

an irrational number is an infinitely repeating number that can not be written as a fraction, instead it must be written as a decimal. A rational number is a number that can be made by dividing two integers (an integer is a number with no fractional part).

The numbers are,

a. 5/4 = Rational

b. √100 = Rational

c. 7.3 = Rational

d. 0.00247  = Rational

e. √4/9  = Irrational

f. √2/24  = Irrational

g. 0.01 (with the line above the 1) = Irrational

What is Number system?

A system of writing to express the number is called number system.

Given that;

The numbers are,

5/4, √100 , 7.3 , 0.00247, √4/9 , √2/24 , 0.01 with the line above the 1.

Now,

Check the numbers as;

5/4  = 1.25

So, The number is a Rational number.

√100 = 10

So, The number is a Rational number.

7.3 = 7.3

So, The number is a Rational number.

0.00247 = 247/100000

So, The number is a Rational number.

√4/9 = 2/3 = 0.666.......

So, The number is a Irrational number.

√2/24

So, The number is a Irrational number.

0.01 with the line above the 1

So, The number is a Irrational number.

Thus, The numbers are,

a. 5/4 = Rational

b. √100 = Rational

c. 7.3 = Rational

d. 0.00247  = Rational

e. √4/9  = Rational

f. √2/24  = Irrational

g. 0.01 (with the line above the 1) = Irrational

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Ava, Cara, Emma, Lily, and Mia are to be seated together in a row. If Emma and Lily must sit next to each other, how many different ways can the five girls be seated

Answers

Answer:

48 ways

Step-by-step explanation:

Given

[tex]Girls = \{Ava, Cara, Emma, Lily, Mia\}[/tex]

[tex]Together= \{Emma, Lily\}[/tex]

Required

Determine the number of sitting arrangements

The number of girls are 5, of which 2 must be seated together.

First, Emma and Lily can be arranged in 2! ways

Next, we consider Emma and Lily as one, so there are (5 - 1) girls left to be arranged.

This can be done in (5 - 1)! ways

Total number of ways is then calculated as:

[tex]Ways = 2! * (5 - 1)![/tex]

[tex]Ways = 2! * 4![/tex]

[tex]Ways = 2 * 1 * 4 * 3 *2 * 1[/tex]

[tex]Ways = 48[/tex]

Hence, there are 48 ways

The possible ways in which Ava, Cara, Emma, Lily, and Mia are to be seated together in a row, while Emma and Lily sit next to each other are 48 ways.

Given to us;

Number of girls = {Ava, Cara, Emma, Lily, and Mia} = 5 girls,

Also, Emma and Lily must sit next to each other, therefore, considering them as a single person,

The choices we are left with = {Ava, Cara, Mia, (Emma, Lily)} = 4 person;

We know to calculate the number of ways people can sit is given by n! (n factorial), where n is the number of person. Thus,

different ways this 4 person can sit = n!

                                                           = 4!

                                                           = 4 x 3 x 2 x 1

                                                           = 24 ways

Further, as given in the question Emma and Lilly must sit together but they can change sits within themselves, So,

different ways Emma and Lilly can sit = n!

                                                              = 2!

                                                              = 2 x 1

                                                              = 2 ways

Therefore, the total number of ways all 5 girls can sit together in which Emma and Lilly will be always seated together,

Total ways all can sit together = 24 x 2

                                                  = 48 ways

Hence, the possible ways in which Ava, Cara, Emma, Lily, and Mia are to be seated together in a row, while Emma and Lily sit next to each other are 48 ways.

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PLEASE I NEED HELP WITH MATH HW WITH EXPLANATION!!!
Question: Find the value of the varible

Answers

Answer:  w = 31

===================================================

Explanation:

For any triangle, the interior angles always add to 180

(angle1)+(angle2)+(angle3) = 180

(w) + (4w-6) + (w) = 180

(w+4w+w) - 6 = 180

6w - 6 = 180

6w - 6+6 = 180+6 .... adding 6 to both sides

6w = 186

6w/6 = 186/6 ..... divide both sides by 6

w = 31

------------------------------------

Extra info:

This value of w leads to

4w-6 = 4*31-6 = 118

The three angles of the triangle are: 31, 118, 31

Because we have two congruent angles, this means the triangle is isosceles. The sides opposite the congruent angles are the same length.

Kenny is ordering uniforms for both the girls' and boys' tennis clubs. He is ordering shirts for 43 players and two coaches at a total cost of $658.35. Additionally, he is ordering visors for each player at a total cost of $368.51. How much with each player pay for the shirt and visor?

Answers

Answer: 23.20 dollars

Cost for 1 shirt = $14.63

Cost for 1 visor = $8.57

Total = 14.63+8.57 = 23.20

==============================================================

Explanation:

s = cost of 1 shirt

v = cost of 1 visor

costs are in dollars

There are 43 players and 2 coaches that get a shirt. There are 43+2 = 45 people total that get a shirt. The amount of money spent on all the shirts is 45s because we multiply the number of people (45) with the cost per shirt (which is s). Set this equal to 658.35 and solve for s

45s = 658.35

s = 658.35/45

s = 14.63

Each shirt costs $14.63, and this is the amount each player should pay.

-------------------

Kenny is also ordering 43 visors. The total cost here is 368.51 dollars. This means the equation we need to solve is 43v = 368.51

Divide both sides by 43 to isolate v

43v = 368.51

v = 368.51/43

v = 8.57

Each visor costs $8.57, and this is the amount each player should pay.

-------------------

Add up the two costs we found and we get 14.63+8.57 = 23.20, which is the total cost each player must pay for both a shirt and a visor.

Arectangle on a coordinate plane is translated 5 units up and 3 units to the left. Which rule describes the translation?
x. y) x+5, y-3)
Oxy)- + 5.y + 3)
(K.)- K-3.y + 5)
(.)-(3.y+ 5)

Answers

Answer:

The first one x=5, y-3

Step-by-step explanation:

is 50 prime or composite? Explain​

Answers

Answer:

composite

Step-by-step explanation:

Answer:

50 is composite

Step-by-step explanation:

it is even:)

there are 20 orange and purple pencils. the number of orange pencils is 1 less than 2 times the number of purple pencils. how many orange and purple pencils are their?

Answers

Answer:

im so srry 25 im not sure

Step-by-step explanation:

i need points :(

HELP ASAP also the I couldn't fkfit the whole thing so that other part of the triangle is a O​

Answers

Answer:

6/3 or 2?

Step-by-step explanation:

i am not completely sure though. I went purely based off of MN/RS, which gave me the ratio 6/3. That also equals 2.

Water is flowing into a large spherical tank at a constant rate. Let V(t) be the volume of water in the tank and H(t) be the height of the water level at time t.
a) Give a physical interpretation of dV/dt and dH/dt.
b) Is dV/dt positive, negative, or zero when the tank is one-fourth full? Justify your answer.
c) Is dH/dt positive, negative, or zero when the tank is one-fourth full? Justify your answer.

Answers

Answer:

A) dV/dt = the rate of change of the given volume of water in the tank with respect to the time, t.

dH/dt = the rate of change of the height of the water in the tank with respect to the time

B) dV/dt is positive

C) dH/dt is positive

Step-by-step explanation:

We are given that;

V(t) is the volume of water in the tank and H(t) is the height of the water level at time t. Thus;

A) dV/dt = the rate of change of the given volume of water in the tank with respect to the time, t.

dH/dt = the rate of change of the height of the water in the tank with respect to the time

B) When the tank is one-fourth full, dV/dt is positive because the volume water in the tank is increasing with time.

C) when the tank is one-fourth full, dH/dt is positive because the height has increased from zero level to 0.25 times the height of the tank. Thus the height is increasing with time.

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