A study was conducted to compare the mean numbers of police emergency calls per 8-hour shift in two districts of a large city. Samples of 100 8-hour shifts were randomly selected from the police records for each of the two regions, and the number of emergency calls was recorded for each shift. The sample statistics are listed here:
Sample size region 1: 100
Sample size region 2: 100
Sample mean region 1: 2.4
Sample mean region 2: 3.1
Sample variance region 1: 1.44
Sample variance region 2: 2.64
Find a 90% confidence interval for the difference in the mean numbers of police emergency calls per shift between the two districts of the city. Interpret the interval.

Answers

Answer 1

Answer:

Step-by-step explanation:


Related Questions

BODMAS QUESTIONS
10-4×0+3÷3​

Answers

Answer: 11

Step-by-step explanation:

Answer:

11

Step-by-step explanation:

Kendra spent 1/3 of her allowance on a book and snack. If she had 4 dollars remaining after purchasing a book and snack, what was the total amount of her allowance.

Answers

Kendra's allowance is $15.

Answer:

Step-by-step explanation:

What is the least common multiple of 19 and 43?​

Answers

Answer:

The Least Common Multiple (LCM) is:   19 x 43 = 817

Step-by-step explanation:

What is the perimeter of a rectangle with a length of 20 inches and a width of 18 inches?

Answers

Answer:

76 in

Step-by-step explanation:

20+20+18+18=76

the perimeter is 76 inches

Find f(-1)
f(x) = (1/5)^x

Answers

Basically u jus substitute -1 for x.
f(-1)=(1/5)^-1
f(-1)=5

If $42.60 is in the tip jar and you share equally with 2 other people what is my share

Answers

Answer:

$14.20

Step-by-step explanation:

$42.60 ÷ 3

$14.20

Answer:

$14.20

Step-by-step explanation:

$42.60 divided by 3 is $14.20

a school has 900 students. 1/6 of the students in the school are in year 7. 2/5 of the year 7 students are going on a trip to the castle. how many year 7 students are going on the trip?

Answers

Answer: 12 students

Step-by-step explanation:

1/6 of 900 is 30 kids. and 2/5 of the 30 kids is 12

Write an equation of the line that passes through a pair of points:
(negative 5, negative 2), (4, 5)
a.
y = StartFraction 7 Over 9 EndFractionx – StartFraction 17 Over 9 EndFraction
c.
y = StartFraction 7 Over 9 EndFractionx + StartFraction 17 Over 9 EndFraction
b.
y = StartFraction 7 Over 9 EndFractionx – StartFraction 9 Over 17 EndFraction
d.
y = Negative StartFraction 7 Over 9 EndFractionx + StartFraction 17 Over 9 EndFraction

Answers

Answer:

c.

y = StartFraction 7 Over 9 EndFractionx + StartFraction 17 Over 9 EndFraction

Step-by-step explanation:

Which describes the graph of y= (x+3)^2 - 4?

A. Opens down with a vertex at (3,-4)
B. Opens up with a vertex at (-3,-4)
C. Opens down with a vertex at (-3, -4)
D. Opens up with a vertex at (3, -4)​

Answers

The answer is the 2nd choice. Hope this helps.

Answer:

Hi! The answer to your question is B. Opens up with a vertex at (-3,-4)

Step-by-step explanation:

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☆Brainliest is greatly appreciated!☆

Hope this helps!!!

- Brooklynn Deka

Given the function f(x) = 4x3 + 13x, what is the gradient of the function when x = 2 ?

Answers

Answer:

y=45x+115

Step-by-step explanation:

We can find the slope of a line tangent to a curve at a point by evaluating the derivative of the function at that point.

We are given the function

f ( x ) = 4 x 3 + 12 x 2 + 9 x + 7

= f ( x ) = 4 x 3 + 12 x 2 + 9 x 1 + 7 x 0

Using the power rule, let's now compute the derivative of  f( x )

f ' ( x ) = ( 3 ⋅ 4 x 2 ) + ( 2 ⋅ 12 x ) + ( 1 ⋅ 9 x 0 ) + 0 ⋅ 7 x − 1

f ' ( x ) = 12 x 2 + 24 x + 9

We can now find the slope of  f ( x )  at  x = − 3  by substituting this value into f ' ( x )

f ' ( − 3 ) = 12 ( − 3 ) 2 + 24 ( − 3 ) + 9

f'(-3)=12(9)+24(-3)+9

f'(-3)=108-72+9

f'(-3)=45(slope of the tangent line at  x = − 3

Now that we have a slope for the tangent line, we need to identify a point on the line.

We know the tangent line touches the function  f ( x )  at the point  x = − 3 , so let's find the value of  f ( x )  at this point:

f(-3)=4(-3)3+12(-3)2+9(-3)+7

f(-3)=4(-27)+12(9)+9(-3)+7

f(-3)=108+108-27+7

f'(-3)=-20

So we know the tangent line goes through the point

(-3,-20)

Finally, we can use the point-slope formula for a line to find the equation of the tangent line.

y=mx+b

To find the value of  b , substitute the values we have calculated for the point and slope of the tangent line:

(-20)=(45)(-3)+b

-20=-135+b

b=115

So our final answer for the equation of the tangent line is:

y=45x+115

 

The red string r is 20 centimeters less than 5 times as long as the orange string s ." ​This can be represented by the expression r = 5 s − 20. Find the length of the red string​ if the length of the orange string is 10 centimeters. ​ The length of the red string is ​ centimeters.

Answers

30 Im pretty sure :>

Los números 4,3×-3,4× esta en progesion aritmética cuál es el cuarto termino

Answers

Answer:  Le preguntaste a tu maestro?

Step-by-step explanation:



5 Bill's trail mix has 6 cups of walnuts
and 10 cups of cranberries. Using
the same recipe, how many cups
of walnuts go with 15 cups of
cranberries?

Answers

Answer:

Umm, I will do my best to comment on this. I feel so bad for all the people that I hit answer and I don´t know it. =( !

Answer:

25.5

Step-by-step explanation:

10÷6=1.7

1.7x15=25.5

Which expression can be used to find the quotient of 184 and 8?
(184÷10)+(8÷2)
(160÷8)+(24÷8)
(18÷3)+(4-2)
(184÷4)+(8÷2)
????????

Answers

your answer is the second option, 160 divided by 8 plus 24 divided by 8.

Simplify:
(13x+4x) - (9x+3x)

Answers

Answer:

5x

Step-by-step explanation:

13x + 4x - 9x - 3x

 5x

This morning, Manny took a history test. There were 50 multiple-choice problems on the test
and Manny answered 10% of them correctly. How many problems did Manny get right?

Answers

Answer:

He got 5 right

Step-by-step explanation:

10% = 0.1

50(0.1) = 5

Answer:

5 questions were answered correctly

Step-by-step explanation:

10% of 50 is 5. So that means 5 questions were answered correctly.

An elevator has a maximum capacity of 950 pounds, and there must be an attendant working in the elevator at all times. A customer asks for the range of the number of people that the elevator can hold, not including the attendant. Assume that the average person weighs 155 pounds. Answer the customer's question. Include in your answer the equation or inequality that you used to find the solution. ​

Answers

Answer:

6 lol just do 155x 6 people

Answer:

the answer is 6 that's not including the attendant

Step-by-step explanation:

do 950/6 and that should help you sorry if this does not help you it is hard to explain. (I'm just not good at explaining)

Graph the line with the equation y = 1/2 x + 5

Answers

Find two points and draw a line through them

y = 1/2(2) + 5

y = 1 + 5, 6

One point is (2,6)

y = 1/2(0) + 5

y = 5

Second point is (0,5)

I inserted a graph on desmos for example

Step-by-step explanation:

Rewrite in slope-intercept form.

[tex]y = \frac{1}{2} x + 5[/tex]

Use the slope-intercept form to find the slope and y-intercept.

Slope is : 1/2

y-intercept: (0,5)

Any line can be graphed using two points. Select two x values, and plug them into the equation in order to find the corresponding y values.

In the relationship between hours driven and distance traveled is y = 45x, which of the following ordered pairs would be graphed on the line that represents the relationship?

Answers

Step-by-step explanation:

(0,0) (1,45) (2,90) (3, 135) (4, 180) etc, etc

Answer:

(4, 180)

Step-by-step explanation:

Choices: (3,5), (4,60), (4,180), (5,9)

y = 45x

The value of y is 45 times the value of x.

The only point in which that is true is (4, 180) since 45 * 4 = 180.

Answer: (4, 180)

A farmer plants 987 apple trees in 9 rows. Can each row have the same number of trees? How do you know?​

Answers

No.. if u divide 987 apples by 9 rows u get 109.6 meaning each row will not have the same amount of apples. (987 divided by 9=109.666667)

Each row cannot have the same number of trees.

What is Divisibility?

In mathematics, the term "divisibility" describes a number's ability to be divided by another number in an equal amount without any residue. For instance, it's simple to understand how 40 by 4 can be divided. A huge piece of land that can be divided into smaller chunks and sold separately is said to be divisible, much as it is obvious when you cut into a pan of brownies and distribute equal amounts to each of your friends.

As per the given data:

Number of apple trees = 987

Number of rows = 9

To find whether each row has the same number of trees:

If 987 is divisible by 9 then, the same number of trees can be there else not.

= (987/9) = (329/3) = 109.667

Not divisible, so same number of trees cannot be there.

Hence, each row cannot have the same number of trees.

To learn more about divisibility, click:

brainly.com/question/21416852

#SPJ2

4x-3=9 what does x equal show work

Answers

Answer:

x = 3

Step-by-step explanation:

4x - 3 = 9

4x = 9 + 3

4x = 12

x = 12/4

x = 3

Give another real object for the following solid figures. Write your answer in the blank
provided
1. Sphere -
2. Cube -
3. Cylinder -
4. Rectangular Prism -
5. Triangular Prism -
matinong sagot po rereport ko ung di matinong sagot​

Answers

Answer:

1 bowling ball

2 box

3 can

4 book

5 pyramid

If we used the quadratic expression below to complete a diamond, what value would go at the very TOP of the diamond? part 1
x^2 - 4x + 5
a. -4
b. 4
c. 1
d. 5

Answers

9514 1404 393

Answer:

  d.  5

Step-by-step explanation:

Using the "diamond method" for factoring a quadratic, the top number is the product of the leading coefficient and the constant. For this quadratic, it is ...

  (1)(5) = 5

The very top number is 5.

how to find the range in a dot plot

Answers

Answer:

By examining the line plot, we find the number with the maximum number of crosses or occurrences. This gives the mode of the data set. We find the smallest and the largest number from the data set and find their difference and this difference is the range of the given data set.

Step-by-step explanation:

ILL GIVE THE BRAINLIEST pls help me with this question EVERYTHING IS IN THE PICTURE PLS HELP DUE TODAY ​​IF YOU PUT A WRONG ANSWER ILL REPORT YOU FASTER THAN ASSIGMENT IS DUE ​​

Answers

Answer:

57 inches

Step-by-step explanation:

thanks, kid.

kmjhugyfhtdrsxfcgvhgftcgvhjtc

Determine the nature of the roots: 5x2 + 20x + 20 - 0
. no real solutions
C.
. a unique real solution
d.
cannot be determined
two distinct real solutions

Answers

Two distinct real solutions

What is the value of x???

Answers

Answer:

22.5

Step-by-step explanation:

22.5 x 3 = 67.5

67.5 + 22.5 = 90

22.5

22.5x3=67.5
67.5 + 22.5=90

Mr. Williams trains a group of student athletes. He wants to know how they are improving in the number of push-ups they can do.


These dot plots show the number of push-ups each student was able to do last month and this month.


How much did the mean number of push-ups increase from last month to this month?


Question 1 options:


2.75 more push-ups



4.375 more push-ups



7.5 more push-ups



There is not enough information given to answer the question.

Answers

Answer:

7.5 more push-ups

Step-by-step explanation:

From the dot plot attached :

Last month mean :

Σfx/Σf

Σfx = [(10*2)+(15*2)+(25*3)+(35*1)] = 160

Σf = (2 + 2 + 3 + 1) = 8

Mean = 160 / 8 = 20

This month mean :

Σfx/Σf

Σfx = [(10*1)+(15*1)+(25*1)+(30*3)+(40*2)] = 220

Σf = (1 + 1 + 1 + 3 + 2) = 8

Mean = 220/8

Mean = 27.5

Difference in mean :

This month mean - Last month mean

27.5 - 20

= 7.5

a circle centered ar the the orgin has a radius of 1/2 what is the equation of the circle

Answers

Answer:

The equation of the circle is [tex]x^2 + y^2 = \frac{1}{4}[/tex]

Step-by-step explanation:

Equation of a circle:

The equation of a circle with center [tex](x_0,y_0)[/tex] and radius r is given by:

[tex](x - x_0)^2 + (y - y_0)^2 = r^2[/tex]

Centered at the the origin

Center (0,0), which means that [tex]x_0 = 0, y_0 = 0[/tex]

radius of 1/2

This means that [tex]r = \frac{1}{2}[/tex]

Equation:

[tex](x - x_0)^2 + (y - y_0)^2 = r^2[/tex]

[tex](x - 0)^2 + (y - 0)^2 = (\frac{1}{2})^2[/tex]

[tex]x^2 + y^2 = \frac{1}{4}[/tex]

The equation of the circle is [tex]x^2 + y^2 = \frac{1}{4}[/tex]

I know this is not about work but I need help. I was watching an anime years ago and I can't remember the name but I hope my description helps.

The anime is about a boy raised by a computer and has a monster friend who eats his arm to survive but the monster didn't mind. Then he turns into a mecha and a spaceship came to take him away... PLEASE tell me the name :(

Answers

Answer: Then Bokurano : ours?

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