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
Arte-miy333 [17]
2 years ago
5

It is known that the amount of time needed to change the oil on a car is normally distributed with a standard deviation of 5 min

utes. The amount of time to complete a random sample of 10 oil changes was recorded and listed here. Compute the 99% confidence interval estimate of the mean of the population.
11 10 16 15 18 12 25 20 18 24
Mathematics
1 answer:
Dmitrij [34]2 years ago
4 0

Answer:

(11.605 ; 22.195)

Step-by-step explanation:

11 10 16 15 18 12 25 20 18 24

Sample mean, xbar = Σx / n = 169 / 10 = 16.9

Standard deviation = 5.152 ( using calculator)

Confidence interval :

Xbar ± Margin of error

Margin of Error = Tcritical * s/√n

Df = n - 1 = 10 - 1 = 9

Tcritical at 99%, df =9 = 3.2498

Margin of Error = 3.2498 * 5.152/√10 = 5.2946

Lower boundary :

16.9 - 5.2946 = 11.6054

Upper boundary :

16.9 + 5.2946 = 22.1946

(11.605 ; 22.195)

You might be interested in
A group of 30 bikers went on a trip. some rode bicycles and the others rode tandems. if the total number of bicycles and tandems
Marina CMI [18]
10 Tandems or 63 Tandems
5 0
3 years ago
Read 2 more answers
PLEASE LOOK AT PHOTO! WHOEVER ANSWERS CORRECTLY I WILL MARK BRAINIEST!!
dusya [7]

Answer:

I'm pretty sure it's 4 sorry if I'm not right I'm not the best at this stuff either

7 0
2 years ago
Read 2 more answers
Why are the solutions to the proportions StartFraction 40 over 8 EndFraction = StartFraction x over 10 EndFraction and StartFrac
UkoKoshka [18]
The answer is B x = 50
4 0
3 years ago
Read 2 more answers
a dejuicer was able to squeeze 1/5 of a pint of juice from a bag of oranges. This amount of juice filled up 1/8 of a jug. At thi
schepotkina [342]
4 and 3/8 and if you round youll need 5 bags
7 0
3 years ago
Read 2 more answers
What is π⋅π⋅π⋅x⋅x⋅x⋅x+ ?
Morgarella [4.7K]

Answer:

4xπ^3

Step-by-step explanation:

6 0
3 years ago
Other questions:
  • What is the range of g?
    11·1 answer
  • Rewrite the equation 7-y=5x+11 to standard form
    6·1 answer
  • Please help me!!! I really need help :)
    11·1 answer
  • OMG PLEASE HELP ME ASAP!!!!!!! A local charity sponsors a 5K race to raise money. It receives $55 per race entry and $10,000 in
    5·1 answer
  • -7=z/-6 solve for z pls help it 7th grade math and it’s on khan ;cc
    15·2 answers
  • Jack is trying to make extra money on his summer vacation from school. He works two different jobs, earning $9 per hour washing
    8·1 answer
  • Help me hw stressing
    11·2 answers
  • I NEED HELP ✋!!!!!!!!!!!!!!!!!!!L!!!!!!!!!!!!
    12·1 answer
  • I need help pls pls I will really appreciate it also l need it step by step pls l will mark you the brainly! pls help!
    11·1 answer
  • 4. Which of the following expressions will have the same value as the expression below? -7-(-5)A. -7+(-5)B. -7-5C. 7+(-5)D. -7+5
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!