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
creativ13 [48]
3 years ago
10

A random sample of 56 fluorescent light bulbs has a mean life of 645 hours. Assume the population standard deviation is 31 hours

. Construct a 95% confidence interval for the population mean
Mathematics
1 answer:
bezimeni [28]3 years ago
3 0

Answer:

Step-by-step explanation:

We want to determine a 95% confidence interval for the population mean.

Number of sample, n = 56

Mean, u = 645 hours

Standard deviation, s = 31 hours

For a confidence level of 95%, the corresponding z value is 1.96.

We will apply the formula

Confidence interval

= mean ± z ×standard deviation/√n

It becomes

645 ± 1.96 × 31/√56

= 645 ± 1.96 × 4.142

= 645 ± 8.12

The lower end of the confidence interval is 645 - 8.12 =636.88

The upper end of the confidence interval is 645 + 8.12 =653.12

Therefore, with 95% confidence interval for the population mean life of fluorescent light bulbs is between 636.88 hours and 653.12 hours

You might be interested in
-9y=3x+81 find slope
natima [27]

Answer:

divide by -9 and you get -3/9x-9 simplify -3/9 to -1/3

Step-by-step explanation:

-1/3x is your slope

4 0
1 year ago
Length width height equals to 62, what is the maximum volume
joja [24]
Assuming that the given shape is a cuboid, 

volume=l×w×h

v=s³ (since cuboids have same length, they have same side length) 

62=s³
∛62=s 
s=3.957 ≈ 4 units 


Hope I helped :) 
4 0
3 years ago
Is -8 rational or irrational number
kicyunya [14]

Answer:

rational number

Step-by-step explanation:

A rational number can be expressed in the form

\frac{a}{b} , where a and b are integers

- 8 = \frac{-8}{1} ← a rational number

8 0
3 years ago
Read 2 more answers
How to spell 680,010 in words
Paladinen [302]
Six hundred eighty thousand and ten.
7 0
3 years ago
Read 2 more answers
-3-4(4x-8)=3(-8x-1) I will give BRAINLIEST! show all steps please :(
mixer [17]

Step-by-step explanation:

-3-4 -32x=3×8x

-3-4-32x=24x

-6=32x+24x

-6=56x

:. x=-28/3

3 0
3 years ago
Read 2 more answers
Other questions:
  • Tessa's class had a math exam where the grades were between 0 and 10. N(g) models the number of students whose grade on the exam
    13·2 answers
  • Find the markup on the following item. A candy bar costing $0.52 and selling for $0.79. 0.27 0.41 0.66 1.31
    10·2 answers
  • 1.all real numbers that are less than -3 or greater than or equal to 5
    9·2 answers
  • What is 12.72 divided by 3.6
    6·1 answer
  • Will mark brainliest
    9·2 answers
  • Solve for x in the following system (show work)<br><br> 3x+4y=8<br> y=3x+17
    12·1 answer
  • Please help this one will give you extra points
    9·2 answers
  • In 1993, funding for a program increased by 0.79 billion dollars from the funding in 1992. In 1994, the increase was 0.49 billio
    13·1 answer
  • What is the value of "x"?​
    8·2 answers
  • Find sin 90° + cos 360° + tan 0°
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!