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
leonid [27]
3 years ago
6

A music buff wants to estimate the percentage of students at a midwestern university who believe that elvis is still alive. how

many students should he include in a random sample if he wants a 90% confidence interval that is less than 10 percentage points wide? (choose the sample size that is closest to your solution) question 7 options:
Mathematics
1 answer:
gulaghasi [49]3 years ago
5 0
Since we are not given any information about the proportion, we will assume the sample proportion to be 0.50

so,
p = 0.50
The Error is 10% percentage point. This means that on either side of the population proportion the error is 5% so E = 0.05
z = 1.645 (Z value for 90% confidence interval)

The margin of error for population proportion is calculated as:

E=z* \sqrt{ \frac{p(1-p)}{n} }  \\  \\ 
 \frac{E}{z} = \sqrt{ \frac{p(1-p)}{n} }  \\  \\ 
( \frac{E}{z} )^{2}= \frac{p(1-p)}{n} \\  \\ 
n= p(1-p)* (\frac{z}{E})^{2}  \\  \\ 
n=271

This means 271 students should be included in the sample
You might be interested in
Queston
Maru [420]

Answer:

$60

Step-by-step explanation:

0.80 x 75 = $60

3 0
3 years ago
Read 2 more answers
A company is bidding on two projects, A and B. The probability that the company wins project A is 0.40 and the probability that
kondaur [170]

Answer:

Probability that the company wins project A or project B is 0.50.

Step-by-step explanation:

We are given that a company is bidding on two projects, A and B. The probability that the company wins project A is 0.40 and the probability that the company wins project B is 0.25.

Also, Winning project A and winning project B are independent events.

Let the Probability of winning project A = P(A) = 0.40

            Probability of winning project B = P(B) = 0.25

<u>Now, as we know that ;</u>

Probability that the company wins project A or project B = P(A \bigcup B)

              P(A \bigcup B) = P(A) + P(B) -  P(A \bigcap B)

So, we have to find the value of Probability of winning project A and B, i.e;

P(A \bigcap B)

<em>Since, we are given that Winning project A and winning project B are independent events which means when this condition is given then;</em>

                    P(A \bigcap B) = P(A) \times P(B)

                                    = 0.40 \times 0.25 = 0.10

Now, Probability that the company wins project A or project B is given by;

                 P(A \bigcup B) = P(A) + P(B) -  P(A \bigcap B)  

                                  = 0.40 + 0.25 - 0.10

                                  = 0.65 - 0.10 = 0.55

Hence, probability that the company wins project A or project B is 0.50.

3 0
2 years ago
Last night, the two dinner specials at Evan's favorite restaurant were salmon filet and steak. The restaurant served 27 salmon f
kherson [118]
Approximately 42% of the specials was salmon filets.
5 0
2 years ago
Which expression is the factored form of −4.5n+3
Andrei [34K]
<span>−3(1.5n−1) is correct </span>
5 0
3 years ago
Prove to me that −1(x)=−x
JulsSmile [24]

Answer:

It does

Step-by-step explanation:

Basically:

-1×x=-1x

When doing Algebra, You never write 1x, you just write x, so therefore it should not be -1x but -x

I hope this helped you, and please give be brainliest.

3 0
2 years ago
Other questions:
  • A wooden toy kit has different painted solids. One solid is a cylinder with diameter 2cm and height 2cm. what is it's volume
    12·2 answers
  • Convert .35 to a percent
    8·1 answer
  • Hannah needs 78 inches of ribbon to make a picture frame.
    13·1 answer
  • What is the value of x in the figure above? ^^
    9·1 answer
  • The measure of BEC is .....<br>The measure of ABE is .....
    8·1 answer
  • Pepe uses these steps to partition segment AB in a ratio of 2:5.
    12·1 answer
  • Three lines intersect at a common point. In the figure below, m∠1=x°, m∠2=2x°, and m∠3=75°.
    9·1 answer
  • What is the equation of a line with a slope of 2 and a y-intercept of -5?
    8·1 answer
  • The original price of a cell phone is $190. The sales tax is 4.9%. What is the total cost?
    5·1 answer
  • Need help asap! Having trouble !
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!