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
Evaluate f(0) given the following graph
ruslelena [56]

Answer:

f(0) = 1

Step-by-step explanation:

Assuming the graph is a function of x, then f(0) = 1.

Plug in 0 for x and ask yourself what is the y coordinate?

6 0
2 years ago
Find the value of X, Z, and Y in the graph below?
ella [17]

9514 1404 393

Answer:

  (x, y, z) = (49, 58, 122)

Step-by-step explanation:

The same-side exterior angles have a sum of 180°.

  (x +9) +(3x -25) = 180

  4x -16 = 180

  x -4 = 45

  x = 49

Vertical angles are congruent:

  y = 49 +9 = 58

  z = 180 -y = 122 = 3(49) -25

The values of x, y, and z are ...

  • X = 49
  • Z = 122
  • Y = 58
7 0
3 years ago
Identify the pattern for the following sequence. Find the next three terms in the sequence. -15, -11, -7,-3, a. Subtract 4; -7,
blondinia [14]
Option d is correct answer
8 0
3 years ago
A zoo had 12 large aquariums with fish. The number of fish in each aquarium is shown 37, 58, 62,36,42,71,56,58,69,66,47,68 what
SSSSS [86.1K]

Answer:

35

Step-by-step explanation:

First, we will define range.

The difference between the highest and lowest values in a data is called range. To find the range, first the highest and lowest values are found from data, then the lowest value is subtracted from the highest value.  

In the above data,

Highest Value=71  

Lowest Value=36  

Range=Highest value-lowest value  

=71-36  

=35  

6 0
3 years ago
HELP PLEASE
stellarik [79]

i think 2 bags or 1 bags hope it helps

7 0
3 years ago
Other questions:
  • The endpoints of a diameter of a circle are A(1,2) and (7.10). Find the area of the circle in terms of pi
    8·1 answer
  • Alicia bought 5 pounds of potting soil. She wants to put 10ounces of soil in each flower pot. How many flower pots can she fill?
    13·1 answer
  • Which complex number has a distance of |17| from the origin on the complex plane?
    15·1 answer
  • NEED ANSWERS QUICK FOR ALL 3!! WILL AWARD BRAINLIEST! PLS HELP!!!
    13·2 answers
  • A water truck is filling a swimming pool. The equation that represents this relationship is y = 19.75x where y is the number of
    11·1 answer
  • I need help with this ​
    14·1 answer
  • A concession stand charges $2.50 for a bag of popcorn. The stand has already sold 30 bags of popcorn. How many more bags x of po
    8·1 answer
  • Need help with some math
    10·1 answer
  • 2. On the snow day, 8 kids from the neighbor-
    8·1 answer
  • A. Does the relationship of weeks passed and total number of followers represent a linear function? (0.5 points) B. What is the
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!