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
SOMEONE MAKE A ENDING PARAGRAPH about someone rescuing me QUICK 40 POINTS!!!!
scZoUnD [109]

Answer:

Although, my life can't end here, life has so much more to offer me. I collected the last of my strength to swim up to to surface where I can be released from the horrors of the deep waters. I swallowed gulps of the chlorine water and my eyes ached from being open for to long. I wrestled the clenching fists of the water that urged me to stay with them. I swam, and swam, swam, until I reached my hands out for help, and that's when I knew I made it. I could feel hands from above grasping me and helping me climb out of the bitter cold pool. I ran into my mother's arms, as a gush of relief spread through my body. The relief of staying in my mothers arm, that helped me forget the isolated pits of the dark waters.

Sorry if it's not that good! I'm not the best writer, and you don't have to use this ending paragraph if you don't want to!!

4 0
3 years ago
a video store took in $5,375 in DVD rentals during july. January sales are expected to be double that amount. If DVDs rent for $
k0ka [10]
I think the answer would be $2,678.6
5 0
3 years ago
How do you find 79% of 32
liubo4ka [24]

Convert 79% to a decimal which is .79

Then you multiply .79 by 32 which is 25.28

Your answer is 25.28

5 0
3 years ago
the line passing through the points A (-1,3k) and B (k , 3) is parallel to the line whose equation is 2y+3x=9. write down the co
vodomira [7]

Answer:

k = 3

Step-by-step explanation:

If the line passing through the points A (-1,3k) and B (k , 3) is parallel to the line whose equation is 2y+3x=9, then their slopes are equal

For coordinate AB;

slope m1 = 3 - 3k/k-(-1)

m1 = 3-3k/k+1

For the line 2y+3x = 9

2y = -3x + 9

y = -3/2 x + 9/2

Slope m2 = -3/2

Since m1 = m2

3-3k/k+1 = -3/2

Cross multiply

2(3-3k) = -3(k+1)

Expand

6 - 6k = -3k - 3

-6k+3k = -3 - 6

-3k = -9

k = -9/-3

k = 3

Hence the value of k is 3

4 0
2 years ago
The cost of Nate's dinner including a 15% tip was $43.70. What was the cost of dinner alone?
Nookie1986 [14]

Answer:

The cost of dinner alone was $37.145

Step-by-step explanation:

15%=0.15----Convert your percentage into a decimal

43.70*0.15=6.555----Multiply the cost of dinner with the decimal

$43.70-$6.555=$37.145----Subtract the last number(6.555) from the total(43.70) to get the cost of dinner alone of $37.145 -This is making you subtract the percentage from the total!

I hope this helped!

7 0
2 years ago
Other questions:
  • Eva earns $16 for walking dogs for 4 hours. If eva charges at the same rate, how many hours will it take her to earn $32
    13·2 answers
  • Solve for x. Use the completing the squares
    9·1 answer
  • Which of the following data could be graphed using a dot plot? Select all that apply
    14·1 answer
  • Simplify the expression x^-4×y^3×x^4×y^2.
    14·1 answer
  • Simplify 15 – 3(6 – 4).
    5·2 answers
  • How many units is -9 from zero on the number line?
    13·2 answers
  • Which phrase best describes the translation from the graph y = (x - 5)2 + 7 to the graph of y = (x + 1)2 – 2?
    14·2 answers
  • A car travels 320 miles in 7.5 hours. If the car continues at the same rate, how far
    5·2 answers
  • Leia cuts congruent triangular patches with an area of 15 square centimeters from a rectangular piece of fabric that is 15 centi
    11·1 answer
  • 120x392=<br> i hope you get it
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!