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
OLEGan [10]
3 years ago
7

More than $70 billion is spent each year in the drive-thru lanes of America’s fast-food restaurants. Having quick, accurate, and

friendly service at a drive-thru window translates directly into revenue for the restaurant According to Jack Greenberg, former CEO of McDonald’s, sales increase 1% for every six seconds saved at the drive-thru. So industry executives, stockholders, and analysts closely follow the ratings of fast-food drive-thru lanes that appear annually in QSR, a publication that reports on the quick-service restaurant industry. The 2012 QSR magazine drive-thru study involved visits to a random sample of restaurants in the 20 largest fast-food chains in all 50 states. During each visit, the researcher ordered a modified main item (for example, a hamburger with no pickles), a side item, and a drink. If any item was not received as ordered, or if the restaurant failed to give the correct change or supply a straw and a napkin, then the order was considered "inaccurate." Service time, which is the time from when the car stopped at the speaker to when the entire order was received, was measured each visit. Researchers also recorded whether or not each restaurant had an order-confirmation board in its drive-thru.
Here are some results from the 2012 QSR study:

• For restaurants with order-confirmation boards, 1169 of 1327 visits (88.1%) resulted in accurate orders. For restaurants with no order-confirmation board, 655 of 726 visits (90.2%) resulted in accurate orders.

• McDonald’s average service time for 362 drive-thru visits was 188.83 seconds with a standard deviation of 17.38 seconds. Burger King’s service time for 318 drive-thru visits had a mean of 201.33 seconds and a standard deviation of 18.85 seconds.

a. Is there a significant difference in order accuracy between restaurants with and without order-confirmation boards? Carry out an appropriate test at the a = 0.05 level to help answer this question.

b Construct and interpret a 99% confidence interval for the difference in the mean service times at McDonald’s and Burger King drive-thrus.

Mathematics
1 answer:
artcher [175]3 years ago
8 0

Answer:

a) There is no significant difference between restaurants with and without order-confirmation boards

b) -12.5 ± 3.604 or C.1.E (-16.10, -8.90)

Step-by-step explanation:

answers are in the attachment below

You might be interested in
ms.Alonzo ordered 4,000 markers for her store. only one tenth of them arrived . how many markers did she receive
ale4655 [162]

Ms. Alonzo received 400 markers because one tenth of 4000 is 400. Hope this helped! 
4 0
3 years ago
Read 2 more answers
How to explain how to plot the points P(4,10) and Q(9,3) in a coordinate plane?
SpyIntel [72]
Firstly, this is the most important thing to know (x,y). This means that you plot the first number in the x axis and the second number in the y axis. For example, (4,10). You would plot the 4 on the right side of the x axis and you would plot the 10 all the way at the top in the y axis.
6 0
3 years ago
Which of the following is the solution of the following inequality?
Brums [2.3K]

Answer:

x = 3

Step-by-step explanation:

4 + 12.5 > 11x - 3.5 - 2x

16.5 = 5.5x

16.5/5.5 = x

5 0
2 years ago
ANSWER ASAP PLEASE FOR BRAINLIEST
PSYCHO15rus [73]

Answer:

<h2><em><u>11.2 - B to C</u></em></h2><h2><em><u>12 - B to A</u></em></h2><h2><em><u>8.8 - A to C</u></em></h2>

You have to multiply all the sides by 4.

B to C = 2.8*4

2.8 * 4 = 11.2

B to A = 3*4

3*4 = 12

A to C = 2.2*4

2.2*4 = 8.8

Hope this helped!

3 0
3 years ago
Rewrite this decimal 4.5 as a mixed fraction in its lowest term. ​
Crazy boy [7]

Answer:

4.5=4 and 1/2

Step-by-step explanation:

4 0
2 years ago
Other questions:
  • WXZY is a quadrilateral with W located at (-5, 2) and X is located at (3, 0). What must be the slope of ZY in order for WXYZ to
    8·1 answer
  • Please answer the question in the image below ASAP
    6·1 answer
  • Micahdisu pls help.<br> Look at both pics pls
    10·1 answer
  • BOSE
    12·1 answer
  • Find y if (6, 2y) &amp; (4, -1) has a slope of 13/3
    14·1 answer
  • Explain and discuss why engineers usually want the minimum variance unbiased estimator achieved by using the MVUE in making engi
    7·1 answer
  • Aiden is putting a carpet on the floor of his bedroom. The carpet is 6 feet long and 7 feet wide. What is the total area of Aide
    15·1 answer
  • PLEASE HELP. WORTH 50 PINTS IF CORRECT. A gate casts a shadow that is 5 feet long. A nearby cactus is 9 feet tall and casts a sh
    12·2 answers
  • The map shows the location of four places in a school. A coordinate plane is shown. There is a point at 5, 2 labeled Front offic
    14·1 answer
  • Refer to the figure to answer the question.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!