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
rjkz [21]
3 years ago
7

Peele is interested in the average price of an entree at a French restaurant, but only has a random sample of 9 prices (prices a

re not listed on the menu). Using this random sample, Key calculates that a 90% confidence interval for the true mean is given by (65, 88). (You can assume the prices follow a normal distribution). Use this information to do the following:
a) Calculate 7. (Hint, what does a confidence interval look like?)
b) Calculate s.
c) Construct a 95% confidence interval for the true mean price of all the entrees, f.
Mathematics
1 answer:
Lisa [10]3 years ago
4 0

Answer:

Xbar = 76.5

s = 24.70

(61.19 ; 91.81)

Step-by-step explanation:

Given that :

Confidence interval = (65, 88)

Recall:

Confidence interval = xbar ± margin of error

Margin of Error = (upper boundary - lower boundary) / 2

Margin of Error = (88 - 65) /2 = 11.5

Taking the lower boundary :

Lower boundary = xbar - margin of error

xbar = lower boundary + margin of error

Xbar = 65 + 11.5

Xbar = 76.5

Margin of Error = Tcritical * s/sqrt(n)

s = sample standard deviation

Tcritical at 90% confidence, df = 9-1= 8 = 1.397

11.5 = 1.397 * s/sqrt(9)

11.5 = 1.397 * s/3

34.5 = 1.397s

s = 34.5 / 1.397

s = 24.695

s = 24.70

C.) 95% confidence interval :

Tcritical at 95%, df = 8 = 1.860

Margin of Error = 1.860 * 24.70/sqrt(9) = 15.311

Confidence interval :

Lower boundary = 76.5 - 15.311

Upper boundary = 76.5 + 15.311

(61.19 ; 91.81)

You might be interested in
Simplify the given expression below 4/3-2i
ANTONII [103]
So-called simplifying, really means, "rationalizing the denominator", which is another way of saying, "getting rid of that pesky radical in the bottom"


\bf \cfrac{4}{3-2i}\cdot \cfrac{3+2i}{3+2i}\impliedby \textit{multiplying by the conjugate of the bottom}
\\\\\\
\cfrac{4(3+2i)}{(3-2i)(3+2i)}\implies \cfrac{4(3+2i)}{3^2-(2i)^2}\implies \cfrac{4(3+2i)}{3^2-(4i^2)}\\\\
-------------------------------\\\\
recall\qquad i^2=-1\\\\
-------------------------------\\\\
\cfrac{4(3+2i)}{3^2-(4\cdot -1)}\implies \cfrac{4(3+2i)}{9+4}\implies \cfrac{12+8i}{13}\implies \cfrac{12}{13}+\cfrac{8}{13}i
4 0
3 years ago
Read 2 more answers
The difference between -2 2/3 and -3/8
zalisa [80]

Answer:

Hope this helps

Step-by-step explanation:

−55/24

5 0
2 years ago
I need help on this question
tatiyna
It is a right agn have a good day
6 0
2 years ago
NO LINKS!!! Part 2: <br><br><img src="https://tex.z-dn.net/?f=y%20%3D%20%5Csqrt%7Bx%7D%20" id="TexFormula1" title="y = \sqrt{x}
garik1379 [7]

Range: 3.5, 1.5

Shape: Right angle

Domain: f(x)=x²

g(x)=1/x

3 0
2 years ago
Read 2 more answers
Ratio of flutes to drums if there are fout flutes and two drums
olga_2 [115]
2 flutes for every drum
5 0
3 years ago
Read 2 more answers
Other questions:
  • A train traveled 350km in 2.5h. what was the average speed of the train?
    14·1 answer
  • the diagram shows a rectangle four of these rectangles are put to together as shown calculate the shaded area
    10·1 answer
  • PLEASE HELP I WILL MARK YOU BRAINLIEST
    8·2 answers
  • Find the slope by changing form Standard Form to Slope Intercept Form<br> 7x- 8y = -56
    11·2 answers
  • Monica works for a food market. She can randomly be assigned to 3 different crews. She can be
    10·1 answer
  • How many terms are in this expression?<br> 3n + 5
    9·2 answers
  • 3a-8a&gt;-20 help I suck at math ​
    13·1 answer
  • Find the missing side of each triangle. Round your answers to the nearest tenth if necessary.
    13·2 answers
  • Write an explicit formula for the nth term 13,18,23,28 <br><br> an=
    11·1 answer
  • PLEASE HELP!!!!!
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!