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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)

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Who know how to do this 100% smart
chubhunter [2.5K]

Answer:

1- \frac{1}{2}

2- 1

3- -2

Step-by-step explanation:

1-

Add the numbers : \frac{5}{10}

Reduce the fraction with 5 : \frac{1}{2}

Solution : \frac{1}{2}

2-

Calculate the difference: \frac{-3}{-3}

Divide: 1

Solution: 1

3-

Subtract the numbers: \frac{6}{-3}

Reduce the fraction : -2

Solution: -2

4 0
3 years ago
Read 2 more answers
1. Explain in a complete sentence if the point (2, -4) is the solution to the system of equations. x + y = -2 2x – y = 8
Temka [501]
So, it says x + y = -2
we just plug in the numbers so,
2 + - 4 = -2
This equation is true and can also be written as
2 - 4 = -2

It also then says that 2x - y = 8
Again, you just plug in the numbers
2 * 2 - (-4) = 8 
This equation is true and can also be writen as,
2*2 + 4 = 8
7 0
3 years ago
The graph of the function g (x) = -3x2 + bx + 2 is shown. What is the value of b?
klio [65]

I can see it goes through the point (2, 2)

b = 6 then

solved it the lazy way, graphically with desmos and a slider for b, see screenshot

7 0
2 years ago
A coordinate plane with a line passing through (0, negative 3), (2, 0), and (4, 3). Which equation represents the graphed functi
Talja [164]

Answer:

y=\frac{3}{2}x-3

Step-by-step explanation:

we have the points

(0,-3),(2,0) and (4,3)

step 1

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The formula to calculate the slope between two points is equal to

m=\frac{y2-y1}{x2-x1}

we take

(0,-3),(2,0)

substitute the values in the formula

m=\frac{0+3}{2-0}

m=\frac{3}{2}

step 2

Find the equation of the line in slope intercept form

y=mx+b

we have

m=\frac{3}{2}

b=-3 -----> the point (0,-3) is the y-intercept

substitute

y=\frac{3}{2}x-3

The graph in the attached figure

5 0
3 years ago
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Quadrilateral WILD is inscribed in circle O. WI is a diameter of circle O. What is the measure of D?
Alika [10]

Answer: 135

Step-by-step explanation:

m<D+45=180

the measure of <D is 135

5 0
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