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
MatroZZZ [7]
2 years ago
12

Can you please help with expressions and equations

Mathematics
1 answer:
slamgirl [31]2 years ago
4 0
Number 1 is 23-7=16
Number 3 is 19-2=17
You might be interested in
An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided by th
monitta

Answer:

a) n =1623

b) ME=2.0538\sqrt{\frac{0.21 (1-0.21)}{1623}}=0.0208    

Step-by-step explanation:

1) Notation and definitions

n random sample taken

\hat p=0.19 estimated proportion of customers are not satisfied with the service provided by the local dealer

Confidence =0.96 or 96%

Me= 0.02 represent the margin of error

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{p(1-p)}{n}})

Part a

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 96% of confidence, our significance level would be given by \alpha=1-0.96=0.04 and \alpha/2 =0.02. And the critical value would be given by:

z_{\alpha/2}=-2.0538, z_{1-\alpha/2}=2.0538

The margin of error for the proportion interval is given by this formula:  

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)  

And on this case we have that ME =\pm 0.02 and we are interested in order to find the value of n, if we solve n from equation (a) we got:  

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}   (b)  

And replacing into equation (b) the values from part a we got:

n=\frac{0.19(1-0.19)}{(\frac{0.02}{2.0538})^2}=1622.912  

And rounded up we have that n=1623

Part b

The margin of error is given by:

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    

So then if w replace the value of n obtained from part a we got:

ME=2.0538\sqrt{\frac{0.21 (1-0.21)}{1623}}=0.0208    

3 0
3 years ago
The midpoint of ab is m(5-2). If the coordinates of a are (6,-5), what are the coordinates of b
Alex
The coordinate of B is (4,1)
7 0
3 years ago
Does anyone know the answer to this?
Alekssandra [29.7K]

Answer:

asa

Step-by-step explanation:

the qngles which are the round things surround the side which are the two lines

8 0
2 years ago
Read 2 more answers
Which expression is the correct one?
Zarrin [17]
According to the logarithmic property of base change, the correpta answer is option one or the first.
 The logarithmic property of base change says that
 loga (b) = logc (b) / logc (a)
 Therefore the same property applies to this problem and the correct expression for this question is:
 logb (x) / logb (a)
3 0
3 years ago
10
beks73 [17]
The person above me is right. It’s A , you have to add
7 0
3 years ago
Other questions:
  • Hellpppp me please !!!!!
    7·1 answer
  • In the number 7.46 the _ in the ones place is 7. The 4 in the _ place is 0.4. The _ in the hundredths place is blank.
    13·1 answer
  • PLEASE HURRY
    9·2 answers
  • (y^x-1)^2 standard form
    10·1 answer
  • Three quarters of the boats in the marina are white, 4/7 of the remaining boats are blue, adn the rest are red. If there are 9 r
    10·1 answer
  • at Mary's party 4/8 of the guest had chocolate ice cream and 3/8 of the guest had strawberry ice cream . what fraction of the ic
    15·2 answers
  • Solve the following problem:<br><br> 1 2/4 + 2 1/16
    9·1 answer
  • Use a protractor to find the angle measure picture is added
    10·1 answer
  • The 3 one is 2x-1 please help​
    14·1 answer
  • You need some dozer work on a field to level a washout that occurred last spring. Mr. Miller charges $60 an hour for his work. H
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!