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
damaskus [11]
3 years ago
13

Analysis showed that the mean arrival rate for vehicles at a certain Shell station on Friday afternoon last year was 4.5 vehicle

s per minute. How large a sample would be needed to estimate this year's mean arrival rate with 98 percent confidence and an error of ± 0.5?
Mathematics
2 answers:
Solnce55 [7]3 years ago
7 0

Answer:

25

Step-by-step explanation:

use a Poisson process to model the arrival.

the mean rate of arrivals  is λ=4.5

The standard deviation is calculated as:

σ==√λ =2.1213

The z-value for a 98% CI is z=2.3262.

If the 98% CI has to be within a error of 0.5 then:

Ul-Ll=2z*σ/√n=2*0.5=1

√n=z*σ=2.3262*2.1213=4.9346

√n=4.9346  and n = 4.9346^2=24.35 rounded to 25

The sample size needed is n=25.

nadezda [96]3 years ago
3 0

Answer:

idk sorry

Step-by-step explanation:

You might be interested in
What is the LCD of 3 8/9 and 1 5/12?<br><br> 108<br> 15<br> 45<br> 36
dangina [55]

Answer:

LCD = 36

Step-by-step explanation:

I'm sure it 36!!!!!!!!!!!!!

6 0
3 years ago
Read 2 more answers
The unit rate for 15 degrees in 2 hours
sladkih [1.3K]
30 should be right ur welcome
3 0
3 years ago
Math Problem:
kirza4 [7]

Answer:

Her answer is not reasonable. Her average is 83.

Step-by-step explanation:

Add all of her test grades together (96+82+78+76=332)

To find the average, you need to add all test grades she got and then divide the sum by the total number of numbers added (in this case, we added 4 tests together, so we need to divide by 4)

\frac{332}{4} =83

So she added wrong and forgot to divide by the total number of tests.

3 0
3 years ago
5 (a)
andrey2020 [161]

Answer:

25

Step-by-step explanation:

25 2 euro coins*2=50

50 1 euro coins*1=50

50+50=100

4 0
2 years ago
Read 2 more answers
Find the value <br> f(t)=2(0.4)^t<br> f(-2)=?
Nuetrik [128]

f(t) = 2(0.4)^t

F(-2) means to replace t with -2:

f(-2) = 2(0.4)^-2

f(-2) = 12.5

4 0
3 years ago
Other questions:
  • The slope of a line that is horizontal, such as is -5 is ______?. A. 0 B. negative C. positive D. undefined
    14·1 answer
  • Is 10 pounds or 10 kilograms greater
    5·1 answer
  • Write the equation -24x+(-4)+-2 in standard standard form using integer coefficients ​
    13·1 answer
  • What is 10^5 as a decimal
    13·1 answer
  • Which of the following is a polynomial?
    9·1 answer
  • A candle burned at a steady rate. After 37 minutes, the candle was 11.2 inches tall. Eighteen minutes later,
    11·1 answer
  • Pls help taking im taking
    8·1 answer
  • A baseball card that originally cost $24 has been decreasing in value
    8·1 answer
  • At a football stadium, 20% of the fans in attendance were teenagers. If there were 10 teenagers at the football stadium, what wa
    6·2 answers
  • The gradiant y=2x³-5x+1 at point (2,7)​
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!