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
Nesterboy [21]
3 years ago
5

Assume that we want to construct a confidence interval. Do one of the​ following, as​ appropriate:_________.

Mathematics
1 answer:
andreyandreev [35.5K]3 years ago
3 0

Answer:

B. z Subscript alpha divided by 2 zα/2 = 1.96.

Step-by-step explanation:

We are given that we want to construct a confidence interval. For this, the summary statistics for randomly selected weights of newborn​ girls:

n = 236​, \bar x = 30.3 ​hg, s = 7.2 hg. The confidence level is 95​%.

As we can clearly see here that the population standard deviation is unknown and the sample size is also very large.

It has been stated that when the population standard deviation is unknown, we should use t-distribution but since the sample size is very large so we can use z distribution also as it is stated that at very large samples; the t-distribution corresponds to the z-distribution.

Here, \alpha = level of significance = 1 - 0.95 = 0.05 or 5%

         \frac{\alpha}{2}=\frac{0.05}{2} = 0.025 or 2.5%

So, the value of Z_(_\frac{\alpha}{2} _) in the z table is given as 1.96 with a 2.5% level of significance.

You might be interested in
The length of a rectangle is the width minus 3 units. The area of the rectangle is 40 units. What is the width, in units, of the
Eva8 [605]

The width of rectangle is 8 units.

Step-by-step explanation:

Given,

Area of rectangle = 40 units

Width = w

Length = w-3

Area = Length * Width

40=(w-3)*w\\40=w^2-3w\\w^2-3w=40\\w^2-3w-40=0

Factorizing the equation

w^2-8w+5w-40=0\\w(w-8)+5(w-8)=0\\(w-8)(w+5)=0

Either,

w-8=0         => w=8

Or,

w+5=0        =>w= -5

As width cannot be negative, therefore

Width of rectangle = 8 units

The width of rectangle is 8 units.

Keywords: area, rectangle

Learn more about rectangles at:

  • brainly.com/question/10538663
  • brainly.com/question/10557275

#LearnwithBrainly

6 0
3 years ago
In a group of 20 there are 7 boys what is the ratio of girls to boys?​
marysya [2.9K]

Step-by-step explanation:

given,

total members in grp = 20

no. of boys = 7

no. of girls = 20 - 7 = 13

so,

the ratio of girls to boys is = 13:7

hope this answer helps you dear...take care and may u have a great day ahead!

4 0
2 years ago
I neeeddddd helpppppppp plllllzzzz
vesna_86 [32]

Step-by-step explanation:

-3x + 7y = 5x + 2y (you subtract the 2y from both sides)

-3× + 5y = 5x (then add 3x to both sides)

5y = 8x (use x = - 5)

5y = 8x - 5 = -40 (both sides are divided by 5)

y = -8

answer is (-5, -8)

6 0
2 years ago
The invention of the telegraph ______________ a. let distant locations communicate quickly. b. kept distant locations from commu
VashaNatasha [74]
The answer is a.......
5 0
2 years ago
Strategies that encourage to buy products include ___.
dimulka [17.4K]

Answer:

Offer lots of information. Consumers look for trustworthy, knowledgeable individuals to educate them on a purchase. .

Step-by-step explanation:

6 0
3 years ago
Other questions:
  • Which expression is equivalent to 2w?
    12·1 answer
  • 5 women each ate 3 mangoes everyday. how many mangoes did they eat in 6 days?
    9·2 answers
  • Find the product of 30x10
    5·2 answers
  • What is 446,221 rounded to the nearest ten thousands
    11·2 answers
  • Where Q and R are polynomials and the degree of R is less than the degree of B.
    11·1 answer
  • I need help with this!
    7·1 answer
  • How do you round 1/3 to the nearest penny
    15·1 answer
  • Partial products of 310x434
    9·2 answers
  • Calculate the surface area and show work :) please help me no links!!
    6·1 answer
  • You want to order a triple scoop ice cream cone with a different flavor for each scoop of there are 23 flavor available how many
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!