The quality control manager at a light bulb manufacturing company needs to estimate the mean life of the light bulbs produced at the factory. The life of the bulbs is known to be normally distributed with a standard deviation (sigma) of 80 hours. A random sample of 16 light bulbs indicated a sample mean life of 1000 hours. What is a 95% confidence interval estimate (CIE) of the true mean life (m) of light bulbs produced in this factory
Answers
Answer: (960.80,1039.20)
Step-by-step explanation:
Let X denotes a random variable that represents the life of the light bulbs produced at the factory.
As per given,
Critical z-value for 95% confidence interval : z* = 1.96
Confidence interval for population mean:
So, a 95% confidence interval estimate (CIE) of the true mean life (m) of light bulbs produced in this factory = (960.80,1039.20)
Related Questions
The difference between two integers is 43. If you double the smaller integer and triple the larger integer the sun is 189. Identify the two integers
Find the mean of the binomial random variable. Round to two decimal places when necessary. According to a college survey, 22% of all students work full time. Find the mean for the random variable X, the number of students who work full time in samples of size 16. Group of answer choices 2.75 4 3.52 0.22
Jenny is either a hippie or an artist. But Jenny is certainly not a hippie. So it can be concluded that Jenny is an artist.
Area of Composite Figures.
*****
x + 3y - 5
-2x + 2y = 14
Answers
Answer:
y = 3
x = -4
Step-by-step explanation:
Hopefully the first equation is x + 3y = 5
x = 5 - 3y
Plug in:
-2(5 - 3y) + 2y = 14
-10 + 6y + 2y = 14
8y = 24
y = 3
x = -4
B.-3
C.0
D.12
Answers
9514 1404 393
Answer:
D. 12
Step-by-step explanation:
Set x=0 and solve for y.
0 -1/2y = -6
y = (-2)(-6) = 12 . . . . . . multiply by -2 to clear the fraction
The y-intercept is 12.
Answers
40% = x/30
multiply by 30
30·0.40 = x = 12
Answers
Answer:
A) The vertex of CDH would be point D.
B) The sides of CDH would be CD & HD.
C) Classify CDH as an acute angle.
Step-by-step explanation:
A) Those are just where they meet in the middle, and D is the middle point of CDH.
B) Those are literally just the sides.
C) There's acute, obtuse, right etc. angles. Acute angles are less than 90 degrees. And your angle is definitely less than 90.
I’ll mark you brainliest
Answers
Answer:52°
Step-by-step explanation:
x+x+14=90
Collect like terms
x+x=90-14
2x=76
Divide both sides by 2
2x/2=76/2
x=38
angle (x+14)°=(38+14)°=52° which is vertically opposite to angle PKQ.
Since Vertically opposite angles
Therefore angle PKQ=52
point change?
Answers
Answer:
It will reflect across the x axis
Hope this helps!