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
mezya [45]
3 years ago
6

Life tests performed on a sample of 13 batteries of a new model indicated: (1) an average life of 75 months, and (2) a standard

deviation of 5 months. Other battery models, produced by similar processes, have normally distributed life spans. The 98% confidence interval for the population mean life of the new model is _________. Group of answer choices
Mathematics
1 answer:
frozen [14]3 years ago
5 0

Answer:

(71.28, 78.72)

Step-by-step explanation:

We have the following information from the statement:

mean (m) = 75

sample standard deviation (sd) = 5

Sample size (n) = 13

Significance level (alpha) = 1 - 0.98 = 0.02

Degrees of freedom for t-d (df) = n - 1 = 13 - 1 = 12

The critical value would be:

t (alpha / 2) / df = T (0.01) / 12 = 2,681 (this for the table)

Margin of error equals:

E = t (alpha / 2) / df * sd / n ^ (1/2), replacing:

E = 2,681 * 5/13 ^ (1/2)

E = 3.72

Therefore, the interval of 98% confidence interval would be:

75 + 3.72 = 78.72

75 - 3.72 = 71.28

(71.28, 78.72)

You might be interested in
Please help me please help me help please help me please
erastovalidia [21]

9514 1404 393

Answer:

  6/2

Step-by-step explanation:

The slope is given by ...

  slope = (y2 -y1)/(x2 -x1)

  slope = (13 -7)/(4 -2) = 6/2

__

The value of the slope can be simplified to ...

  slope = 3

6 0
2 years ago
Very easy! PLEASE HELP I will mark brainliest
Sladkaya [172]

Answer:

B i think let me solve

Step-by-step explanation:

8 0
3 years ago
PLEASE HELP!!!!!
statuscvo [17]
The second one is the function
6 0
3 years ago
Read 2 more answers
Solve the inequality.
mr Goodwill [35]

Answer:

which inequality? where the question ?

Step-by-step explanation:

4 0
3 years ago
What is missing for the following quantity to be true? 3x + 4y + 7a = 4y + 3x + __
Alex
The answer to your question is 7a.

4 0
3 years ago
Other questions:
  • The length of a sand volleyball court is twice its width. The perimeter is 180 feet. Find the length and width of the sand volle
    5·1 answer
  • What is the factored form of the expression k^2 - 9h^2
    10·1 answer
  • Need Answer Fast Please to solve the Linear Expression: 5(5n+2)+(3-2n)
    7·2 answers
  • A video game company surveys a random sample of 225 of its best customer and finds that the average gamer spends $606 a year on
    11·1 answer
  • in a sale there is twenty five per cent off all prices a bed cost £33 in the sale how much was it before the sale ?
    7·1 answer
  • Write the standard form of the equation of each line. How do I find the slope and y-intercept with the graph for problem 6???
    11·1 answer
  • Which statement is true about the given function
    7·2 answers
  • Find the LCM of 6 and 15.
    12·2 answers
  • What is the 11th term of the geometric sequence with this explicit formula?<br> an = 5.(-2)(n-1)
    11·1 answer
  • A)<br> 450 mm2<br> B)<br> 67,500 mm2<br> C)<br> 600 mm2<br> D)<br> 150 mm2
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!