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
tatyana61 [14]
3 years ago
15

A random sample of 25 roundtrip flights between Philadelphia and Dallas has an average airfare of $393.50 with a sample standard

deviation of $50.30. The 95% confidence interval around this sample mean is ________.
Mathematics
1 answer:
Sauron [17]3 years ago
5 0

Answer:

$393.50+/-$19.72

= ( $373.78, $413.22)

Therefore, the 95% confidence interval (a,b) = ($373.78, $413.22)

Step-by-step explanation:

Confidence interval can be defined as a range of values so defined that there is a specified probability that the value of a parameter lies within it.

The confidence interval of a statistical data can be written as.

x+/-zr/√n

Given that;

Mean x = $393.50

Standard deviation r = $50.30

Number of samples n = 25

Confidence interval = 95%

z value(at 95% confidence) = 1.96

Substituting the values we have;

$393.50+/-1.96($50.30/√25)

$393.50+/-1.96($10.06)

$393.50+/-$19.7176

$393.50+/-$19.72

= ( $373.78, $413.22)

Therefore, the 95% confidence interval (a,b) = ($373.78, $413.22)

You might be interested in
Determine whether each pair of ratios are equivalent. Explain (3/5),(9/15)
Lyrx [107]
Multiple both ratios by a least common denominator 
the least common denominator for both is 15
multiply the first ratio by 3/3
9/15=9/15 
both are equal because when multiplying by the least common denominator you get the same answer
6 0
3 years ago
Help ( i need to show my work)!!!
hodyreva [135]

its 7 because 7*7=49 and 49*7=343

so the cube root of 343 would be 7

8 0
3 years ago
What is 1 + 1???????????????????????????????????????????????????
choli [55]
Answer: 2

Have a good day ¯\_(ツ)_/¯
8 0
3 years ago
Read 2 more answers
Please help me with this/ will give brainlist
nalin [4]

Answer:

102 degrees bc it is vertical angle means there's same degree

6 0
2 years ago
Read 2 more answers
3. Use the diagram of a REGULAR HEXAGON and follow these steps to solve for the area of a hexagon with sides equal to 4 cm. Leav
Delicious77 [7]

Answer:

There are 6 equilateral triangles

you get an isosceles triangle

the height of the equilateral triangle is 4

this is all I have so far :)

3 0
3 years ago
Other questions:
  • A small Business earns a profit of $6500 in January and $17,500 in May. What is the rate of change in profit for this time perio
    8·1 answer
  • Use the summation formulas to rewrite the expression without the summation notation. summation_k = 1^n 12k(k - 1) / n^3 Use the
    11·1 answer
  • If square ABCD is dilated by a scale factor of 1 3 with a dilation center at vertex A, by what factor does the area of the squar
    15·1 answer
  • PLZZZ HELP I DONT UNDERSTAND THIS AT ALLLLLL. :( :(
    11·1 answer
  • THIS IS MY LIKE 5TH TIME ASKING THIS QUESTION PLEASE ANSWER FULLY AND CORRECTLY!!!
    8·1 answer
  • What single percentage change is equivalent to a 17% decrease followed by a 12% increase​
    7·1 answer
  • After the math contest, Basil noticed that there were four extra-
    14·2 answers
  • There is a 72% chance that you will get an exam next week. What is the probability that you will NOT get an exam next week?
    11·1 answer
  • Brooklyn needs to order some new supplies for the restaurant where she works. The
    9·1 answer
  • your grade varies directly with the time you study if you study for 40 minutes your grade is an 80 how long should you study to
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!