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
Tanya [424]
3 years ago
13

Question on Statistics and Confidence Intervals

Mathematics
1 answer:
Digiron [165]3 years ago
4 0

The phrasing "nine times out of ten" means 9/10 = 0.90 = 90% is the confidence level. We're confident 90% of the time that the confidence interval captures the population parameter we're after (in this case mu = population mean)

The portion "have an average score within 5% of 75%" means that 75% = 0.75 is the center of the confidence interval, and it goes as low as 0.75 - 0.05 = 0.70 and as high as 0.75 + 0.05 = 0.80

This confidence interval is from 70% to 80%, meaning that nine times out of ten, we're confident that the average score is between 70% and 80%

We write the confidence interval as (0.70, 0.80). It's common to use the notation (L, U) to indicate the lower (L) and upper (U) boundaries. You might see the notation in the form L < mu < U. If so, then it would be 0.70 < mu < 0.80; either way they mean the same thing.

The margin of error is 0.05 as its the 5% radius of the interval. It tells us how far the most distant score is from the center (75%)

=========================================

In summary, we have these answers

  • confidence level = 90%
  • margin of error = 5% = 0.05
  • confidence interval = (0.70, 0.80)
  • interpretation = We're 90% confident that the average exam score is between 0.70 and 0.80
You might be interested in
Area of triangle where A=50, b=31, c=18
Mrac [35]
Use Heron's Formula:
s means semi-perimeter = (50 + 31 + 18) / 2 = 99 / 2 =
49.5
area = sq root [(s * (s-a) * (s-b) * (s-c)]
area = sq root [(49.5 * (s-a) * (s-b) * (s-c)]

This will NOT form a triangle.  The longest side (50) is greater than the sum of the other 2 sides.

Source:
http://www.1728.org/trianinq.htm

 


5 0
3 years ago
How to make a mixed number a decimal
ra1l [238]
First make it a fraction, then divide numerator by denominator
3 0
3 years ago
Read 2 more answers
What is the area of a triangle with a base of 2 5/8 mm and a height of 10 mm?
MrRissso [65]

Answer:

b looks like the more reziable awnser

Step-by-step explanation:

5 0
3 years ago
Find the product.<br><br> (23)(−98)(−45)(−1)<br> Enter the correct product in the box.
torisob [31]

Answer:

-101,430

Step-by-step explanation:

23 x 98 x 45 x 1 equals 101,430, but the real trick of the question is whether it is positive or negative.

23(-98) forms a negative number (-2,254)

-2254(-45) forms a positive number (101,430)

101,430(-1) forms a negative number (-101,430)

4 0
3 years ago
Awnser please now !!!!!!!!!!!!!!
polet [3.4K]

Answer:

(2, 0)

Step-by-step explanation:

The x intercept is when y is equal to 0.

Therefore,

8x-1/3*0=16

8x=16

x=2

The answer is (2,0)

5 0
2 years ago
Read 2 more answers
Other questions:
  • When comparing answers on a group assignment, Jenny and Jeremy found their answers did not match
    8·1 answer
  • What is the square root if 54
    6·1 answer
  • Find the area and perimeter for number 19 and 20 with work please
    10·1 answer
  • Indicate the equation of the given line in standard form.
    12·2 answers
  • Jill wants to solve the following system using the elimination method:
    8·2 answers
  • A. It is not possible to determine if the triangles are congruent
    15·1 answer
  • Ok answer this question and i'll mark as brainliest and give u a cookie
    11·1 answer
  • A town has a population of 12,000 and grows at 5% every year what will the population after 12 years be to the nearest whole num
    7·1 answer
  • Rosa represents her school as -2, because it is two blocks south of her house. Yesterday, Rosa left school and walked either nor
    7·1 answer
  • The triangles shown below must be congruent.<br> False<br> True
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!