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
Sladkaya [172]
3 years ago
11

A battery manufacturer advertises that the mean reserve capacity of a certain battery is 1500 hours. You suspect that the batter

ies’ reserve time is less than the advertised value. To test this claim, you randomly select a sample of 20 batteries and find the mean reserve capacity to be 1320 hours. Assume that the population standard deviation is 320 hours. Do you have enough evidence to support the manufacturer’s claim? What assumption is necessary for this test to be valid? None. The Central Limit Theorem makes any assumptions unnecessary. The population of all the batteries’ reserve time is normally distributed because of the small sample size. The population variance must equal the population mean.
Mathematics
1 answer:
alexdok [17]3 years ago
8 0

Answer:

The test statistic t =  2.45 > 1.729

we rejected null hypothesis so the population mean is not equal population variance

Step-by-step explanation:

The mean reserve capacity of a certain battery is(μ) 1500 hours

Given sample of  n = 20 batteries

The sample mean reserve capacity to be (x)=1320 hours.

Assume that the population standard deviation is(σ) = 320 hours

Null hypothesis:H0 = μ = 1500 hours

Alternative hypothesis:H1 = μ ≠ 1500 hours

The test statistic

t = \frac{x-u}{\frac{σ}{\sqrt{n} } }

now simplification, we get

t = \frac{1320-1500}{\frac{320}{\sqrt{20-1} } }

t = modulus(-2.45) = 2.45

Degrees of freedom γ = n-1 = 20-1 =19

By tabulated value in t- distribution at 5% level of significance

tabulated value = 1.729 ( from table)

The calculated value > tabulated value

we rejected null hypothesis .

we rejected null hypothesis so the population mean is not equal population variance

You might be interested in
Activity which odd number comes immedediatly before 87?​
sergejj [24]
85 comes immediately before

6 0
3 years ago
After eating 25 percent of the pretzels, Sonya had 42 left how many pretzels did Sonya have originally??? How do I get the Answe
madreJ [45]
42 + 25% = 52 ( 25% is 1/4)
7 0
3 years ago
What does 3√2 mean is it to multiply he square root ?
NNADVOKAT [17]

Answer: Yes, it means 3 times the square root of 2. First, find the square root of 2. Then multiply that value by 3. You can also type it into a calculator, and it will give you the exact value.

3 0
2 years ago
No link or bot answer right
Margaret [11]

Answer:

1/6^8

Step-by-step explanation:

the answer is the one right next to the submit answer

3 0
2 years ago
What is the sixth term of the sequence shown in the table ​
horsena [70]

Answer:

375

Step-by-step explanation:

trust me

:)

4 0
3 years ago
Read 2 more answers
Other questions:
  • The volume of a cone is 36 xin 3. What is the volume of a cylinder with the same base and height as the cone?
    13·1 answer
  • Rename 2934 as tens and ones
    11·1 answer
  • amy bill and cara each played a game . amy’s scored was ten times bill’s scored . cara’s down the ratio of amy’s scored to bill’
    7·1 answer
  • In a basketball game, Patrick scores twice as
    7·2 answers
  • PLEASE HELP EASY!!! IN THE PHOTO 5TH GRADE HELP
    12·1 answer
  • How would i find the slope and y intersept of 3y=5x-18
    11·2 answers
  • Giving out brainliest!
    10·1 answer
  • The area of a circle, in terms of <br> π<br> , is 36<br> π<br> m2.<br> Find the value of the radius.
    10·1 answer
  • Answer the question correctly for good luck
    13·1 answer
  • X+6y=28, solve for y
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!