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
Darina [25.2K]
3 years ago
6

A simple random sample of 100 batteries is selected from a process that produces batteries with a mean lifetime of 32 hours and

a standard deviation of 3 hours. Thus the standard deviation of the sampling distribution is equal to 0.3.
If the sample size is changed to 400, what is the new standard deviation of the sampling distribution?a. It is one‐fourth as large as when n = 100.b. It is one‐half as large as when n = 100.c. It is twice as large as when n = 100.d. It is four times as large as when n = 100.e. The value of σ does not change.
Mathematics
1 answer:
Brrunno [24]3 years ago
7 0

Answer:

.b. It is one‐half as large as when n = 100.

Step-by-step explanation:

Given that a  simple random sample of 100 batteries is selected from a process that produces batteries with a mean lifetime of 32 hours and a standard deviation of 3 hours.

i.e. s = 0.3

we obtain se of sample by dividing std devitation by the square root of sample size

i.e. s= \frac{3}{\sqrt{n} }

when n =100 this = 0.3 and

when n =400 this equals 0.15

We find that when sample size is four times as large as original, std deviation becomes 1/2 of the original

Correction option is

.b. It is one‐half as large as when n = 100.

You might be interested in
I need help please I would really appreciate it
Alchen [17]

Answer:

Your answer to the fig. would be 14cm^2.

Adding area of both rectangles,

(8+6) cm^2

= 14cm^2

Hope it helps!!

6 0
3 years ago
Read 2 more answers
A rectangular table top measures 7/9 of a meter long by 5/4 of a meter wide.<br> What is its area?
Rzqust [24]

Answer:

35/36 sq meters

Step-by-step explanation:

7/9 x 5/4 = 35/36 sq meters

8 0
3 years ago
Read 2 more answers
Please help me! Giving right answer brainiest!
motikmotik
<span>A. an observational study, since they were not assigned to their groups.</span>
4 0
3 years ago
50 POINTS !!<br><br><br> PLEASE HELP !! ILL GIVE BRAINLIEST TO THE RIGHT ANSWERS.
lorasvet [3.4K]

Answer:

60

Step-by-step explanation:

you can use the equations for the pythagorean theorem which is a^2 + b^2 =c^2. plug in the numbers you know and then you figure out what yhe missing value is.

8 0
3 years ago
I need this as soon as possible. Select all irrational numbers.
Phoenix [80]

A rational number can be expressed in the form

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

Otherwise irrational

Note that \sqrt{8}, \sqrt{10}, \sqrt{2} are all irrational

\sqrt{}\frac{1}{16} = \frac{1}{4} → rational

\sqrt{}\frac{1}{8} → irrational

\sqrt{}\frac{1}{10} → irrational

\sqrt{}\frac{1}{4} = \frac{1}{2} → rational

\sqrt{}\frac{1}{2} → irrational





4 0
3 years ago
Other questions:
  • How do i solve -(1+7x)-6(-7-x)=36
    10·2 answers
  • Y= 2x + 5 what is the linear function of this?
    14·1 answer
  • What is the Equation of a line that has a slope<br> of -3 passes to the point (4,-5)
    8·2 answers
  • stans steakhouse has a server to cook ratio of 5 to 2 the total number of servers and cooks is 42 how many servers does Stans st
    15·2 answers
  • HELLLLLLLLLLLLLLP PLLLLLLLSSS, I NEED HELP WITH THIS ANSWER
    11·2 answers
  • Somebody please help quick! solve for x
    11·2 answers
  • Which ordered pair is a solution of the equation?<br> y = -6x+1
    5·2 answers
  • What percentage of 440 is 325
    5·2 answers
  • Graph x &lt;3<br> Please help me
    9·1 answer
  • Use the drop-down menus to compare −2.25 and −3.
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!