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
allochka39001 [22]
3 years ago
14

business statistics 8-10 In an article in Marketing Science, Silk and Berndt investigate the output of advertising agencies. The

y describe ad agency output by finding the shares of dollar billing volume coming from various media categories such as network television, spot television, newspapers, radio, and so forth. a Suppose that a random sample of 400 U.S. advertising agencies gives an average percentage share of billing volume from network television equal to 7.46 percent, and assume that the population standard deviation equals 1.42 percent. Calculate a 95 percent confidence interval for the mean percentage share of billing volume from network television for the population of all U.S. advertising agencies.
Mathematics
1 answer:
Allisa [31]3 years ago
5 0

Answer: (7.321\ , \ 7.599)

Step-by-step explanation:

Given : Sample size : n= 400  () large sample

Significance level : \alpha: 1-0.95=0.05

By using Standard normal table , Critical value : z_{\alpha/2}=1.96

Sample mean : \overline{x}= 7.46

Standard deviation: \sigma=1.42

The confidence interval for population means is given by :-

\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}

=7.46\pm(1.96)\dfrac{1.42}{\sqrt{400}}

\approx 7.46\pm0.139=( 7.46-0.139,\ 7.46+0.139)\\\\=(7.321\ , \ 7.599)

Hence, the 95 percent confidence interval for the mean percentage share of billing volume from network television for the population of all U.S. advertising agencies = (7.321\ , \ 7.599)

You might be interested in
2x + (-x) + 3 + (-2)
meriva

Answer:

-x+3

Step-by-step explanation:

hope this helps

4 0
3 years ago
Peter uses the equation y = StartFraction 13 over 4 EndFraction x to model the number of miles that he has walked in x hours. Wh
Alla [95]

The statement C is true about the proportional relationship that is modeled by Peter’s equation. Peter walks at a rate of 13/4 miles per hour.

<h3>What is the equation?</h3>

A mathematical statement consisting of an equal symbol between two algebraic expressions with the same value is known as an equation.

The complete question is

"Peter uses the equation Y=13/4x to model the number of miles that he has walked in x hours. Which statement is true about the proportional relationship that is modeled by the peat there's the equation?

A: Peter walks a rate of 4/13 miles per hour.

B: Peter walks at a  rate of 4 miles per hour.

C: Peter walks at a rate of 13/4 miles per hour.

D: Peter walks at a rate of 13 miles per hour."

Given equation;

Y=13/4x

Where,

y represents the number of miles

x is the time period

The equation shows Peter walks at a rate of 13/4 miles per hour.

Hence statement C is true about the proportional relationship that is modeled by Peter’s equation.

To learn more, about equations, refer;

brainly.com/question/10413253

#SPJ1

6 0
2 years ago
Strawberries cost $21.25 for 4 pounds. Find the unit rate. Round to the nearest cent if necessary.
gizmo_the_mogwai [7]

Answer:

$5.31/lb

Step-by-step explanation:

Since 4 pounds cost $21.25, 1 pound of strawberries will cost 21.25 / 4 ≈ 5.31, therefore, the unit rate is $5.31/lb.

3 0
3 years ago
Read 2 more answers
Which of the following values of r will result in a true statement when substituted into the given equation?
wariber [46]
I think that it is A I guessed
5 0
3 years ago
This uses pythagorean theorem
Klio2033 [76]

Step-by-step explanation:

x²=a²+b²

x=√6²+12²

x=√180

x=3√2v

y²=16²+12²

y=√400

y=20

7 0
2 years ago
Read 2 more answers
Other questions:
  • Factor as the product of two binomials.<br><br> 9 - 6x + x^2
    13·2 answers
  • PLEASE ANSWER!
    14·2 answers
  • Julius noticed that if he takes the opposite of his age and adds 50, he gets the number 30. How old is Julius?
    13·1 answer
  • Which of the following is equivalent to sqrt-75
    13·1 answer
  • Franklin walked 1/2 mile in 8 1/2 minutes. What is the unit rate in miles per minute ?
    7·1 answer
  • I have a question about brainly.... how can i change my name?
    12·2 answers
  • The length of the red line segment is 8 and the length of the blue line segment is 4. How long is the major axis of the eclipse?
    14·1 answer
  • (-3.4k-7)+(3k+21) find the sum
    8·1 answer
  • A taxi service charges an initial fee plus $1.80
    15·2 answers
  • What is the slope of this line whose equation is y=1/6x-1/2
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!