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
gulaghasi [49]
3 years ago
13

To determine whether they need to hire extra help for the holiday season, the managers of a railroad company want to estimate ho

w long, on average, it takes a crew to unload a freight car at the Lafayette station. They will calculate an estimator as the sample mean of a random sample of unloading times. The managers want the sample mean to have a standard error of 1.51.5 minutes. The corporate office has provided a standard deviation of 99 minutes to use for calculation purposes. How large should the random sample be to ensure the sample mean has the desired standard error?
Mathematics
1 answer:
nadezda [96]3 years ago
3 0

Answer:

36

Step-by-step explanation:

Data provided in the question:

Standard error = 1.5 minutes             ( ∵ number are repetitive 1.51.5 )  

Standard deviation = 9 minutes        ( ∵ number are repetitive 99 )

Now,

Standard error = ( Standard deviation ) ÷ √n

Here,

n is the sample size

Therefore,

on substituting the respective values, we get

1.5 = 9 ÷ √n

or

√n = 9 ÷ 1.5

or

√n = 6

or

n = 6² = 36

You might be interested in
Pls help
Arturiano [62]

Answer:

Rule #4

Step-by-step explanation:

'Im' needs an apostrophe because it is a contraction I'm means I am

4 0
3 years ago
Read 2 more answers
15.624 as a fraction
Fittoniya [83]

15 624/1000   is it supposed to be sipplified?

8 0
3 years ago
Read 2 more answers
The scarf that Anita is knitting is 12/1-4 inches long. The scarf that Jeff is knitting is 4 times as long. How long is Jeff’s s
Lisa [10]
If you meant 12 1/4 inches long then your 4 feet and 1 inch long or 49 inches.
3 0
3 years ago
Read 2 more answers
Who ever answers this first gets brainlist<br><br> What is 6^8
kumpel [21]

Answer:

1679616

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
(4,-2) m=-1 how can you graph this
Svet_ta [14]
Ok, so assuming you know what the slope of -1 looks like

a bit like \ except more diagonal

you look for point (4,-2), then you draw the -1 slope from it

it should cross through points (5,-3) and (3,-1)
5 0
3 years ago
Read 2 more answers
Other questions:
  • s the value of 3 +(-3) what is the value of (-10.4) + 10.4? these pairs of numbers are called opposites. what is the sum of a nu
    9·2 answers
  • Which of the following algebraic expressions does not represent the word phrase, "a number times five"?
    12·1 answer
  • Which of the following is not a correct name for the line shown?
    6·2 answers
  • Slope of line -3,7 3,15
    13·1 answer
  • For how many days, x, can Michelle make a $2 donation if she wants to make a donation of $12 total?
    13·1 answer
  • What are the next three terms in the sequence 4,8,12,16?
    11·2 answers
  • What is the slope of y= -4x-3​
    13·1 answer
  • 10 + (-3 3/8) = i need the answer
    10·1 answer
  • YOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
    5·1 answer
  • If 110% of a number is 528, then the number is:
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!