1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vivado [14]
3 years ago
13

A researcher wants to know if the average time in jail for robbery has increased from what it was several years ago when the ave

rage sentence was 7 years. He obtains data on 400 recent robberies and finds an average time served of 7.5 years. If we assume the standard deviation is 3 years, perform a significance test (calculating the P-value) at the 0.05 level.
Mathematics
1 answer:
Fynjy0 [20]3 years ago
3 0

Answer:

So, the interval is : (7.206,7.794)

Step-by-step explanation:

The mean μ = 7.5

Standard deviation σ=3

n = 400

At 95% confidence interval, the z score is 1.96

7.5+1.96(\frac{3}{\sqrt{400} } )

And 7.5-1.96(\frac{3}{\sqrt{400} } )

7.5+0.294 and 7.5-0.294

So, the interval is : (7.206,7.794)

You might be interested in
In geometry, how do defined terms and undefined terms relate to each other
inysia [295]
<span> </span>
<span><span><span>In geometry, how do defined terms and undefined terms relate to each other? 
</span><span><span>Ask for details </span> <span>Follow </span> Report</span> <span>by <span>Da5ncing4bearnelogi </span>05.08.2016</span></span>Answers<span><span>Hussain514 </span> Ambitious</span>In geometry, definitions are formed using known words or terms to describe a new word. There are three words in geometry that are not formally defined. These three undefined terms are point, line and plane. 

POINT (an undefined term) 
In geometry, a point has no dimension (actual size). Even though we represent a point with a dot, the point has no length, width, or thickness. A point is usually named with a capital letter. In the coordinate plane, a point is named by an ordered pair, (x,y). 

LINE (an undefined term) 
In geometry, a line has no thickness but its length extends in one dimension and goes on forever in both directions. A line is depicted to be a straight line with two arrowheads indicating that the line extends without end in two directions. A line is named by a single lowercase written letter or by two points on the line with an arrow drawn above them. 

PLANE (an undefined term) 
In geometry, a plane has no thickness but extends indefinitely in all directions. Planes are usually represented by a shape that looks like a tabletop or wall. Even though the diagram of a plane has edges, you must remember that the plane has no boundaries. A plane is named by a single letter (plane m) or by three non-collinear points (plane ABC). 

Undefined terms can be combined to define other terms. Noncollinear points, for example, are points that do not lie on the same line. A line segment is the portion of a line that includes two particular points and all points that lie between them, while a ray is the portion of a line that includes a particular point, called the end point, and all points extending infinitely to one side of the end point. 

Defined terms can be combined with each other and with undefined terms to define still more terms. An angle, for example, is a combination of two different rays or line segments that share a single end point. Similarly, a triangle is composed of three noncollinear points and the line segments that lie between them. 

Everything else builds on these and adds more information to this base. Those added things include all the theorems and other "defined" terms like parallelogram or acute angle. <span>
</span></span>
3 0
2 years ago
Find the maximum rate of change of f(x,y,z=x y/z at the point (2, -3, 5 and the direction in which it occurs. maximum rate of ch
kherson [118]
f(x,y,z)=x+\dfrac yz
\implies \nabla f(x,y,z)=\left(1,\dfrac1z,-\dfrac y{z^2}\right)
\implies \nabla f(2,-3,5)=\left(1,\dfrac15,\dfrac3{25}\right)

The maximum rate of change is then

\|\nabla f(2,-3,5)\|=\dfrac{\sqrt{659}}{25}

which occurs in the direction of \nabla f(2,-3,5) above.
6 0
3 years ago
Part One
bogdanovich [222]

Answer:

that would be nice for you to have to say about me nila rc

6 0
1 year ago
HELP I CANT FIGURE IT OUT!<br><img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B5%7D%7B18%7D%20%20-%20%20%5Cfrac%7B1%7D%7B4%7D%20"
bija089 [108]

<em>Answer:</em>

<em>1/36</em>

<em>Step-by-step explanation:</em>

<em>²⁾5/18 - ⁹⁾1/4 =</em>

<em>= 10/36 - 9/36</em>

<em>= 1/36</em>

8 0
2 years ago
A caterpillar eats through 2/3 leaves for every 4/5 minutes. What is the unit ratio for leaves eaten through to minutes?
eimsori [14]

Answer:

1 1/5

Step-by-step explanation:

8 0
2 years ago
Other questions:
  • Draw the graph of y = 3x - 1<br> on the grid.
    12·1 answer
  • What is 9/54 in its simplest form
    11·2 answers
  • Please help! This is due tomorrow. ;c
    13·1 answer
  • Which expression represents the difference (6b+9) – (7b — 4)?
    15·1 answer
  • Can someone answer this
    11·1 answer
  • Help meeee im stuck on this my mom wont let me be wihout doing hw
    6·2 answers
  • Can somebody please help me with this question?
    12·2 answers
  • How many 1/12pieces are in 3/3?
    10·1 answer
  • Which inequality has the graph shown below?
    12·1 answer
  • Solve this problem...!
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!