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
zzz [600]
3 years ago
10

The government of Preon (a small island nation) was voted in at the last election with 58% of the votes. That was 2 years ago, a

nd ever since then the government has assumed that their approval rating has been the same. Some recent events have affected public opinion and the government suspects that their approval rating might have changed. They decide to run a hypothesis test for the proportion of people who would still vote for them.
The null and alternative hypotheses are:

H0: TT = 0.58

HA: Pi symbol ≠ 0.58

The level of significance used in the test is α = 0.05. A random sample of 114 people are asked whether or not they would still vote for the government. The proportion of people that would is equal to 0.684. You may find this standard normal table useful throughout this question.

a)Calculate the test statistic (z) for this hypothesis test. Give your answer to 3 decimal places.

z =

b)According to this test statistic, you should accept, reject, not reject the null hypothesis.
Mathematics
1 answer:
mel-nik [20]3 years ago
7 0

Answer:

a) z=\frac{0.684 -0.58}{\sqrt{\frac{0.58(1-0.58)}{114}}}=2.250  

b) p_v =2*P(z>2.250)=0.0244  

If we compare the p value and the significance level given we see that p_v we have enough evidence to reject the null hypothesis at 5% of significance.

Step-by-step explanation:

Data given and notation

n=114 represent the random sample taken

\hat p=0.684 estimated proportion of people that their approval rating might have changed

p_o=0.58 is the value that we want to test

\alpha=0.05 represent the significance level

Confidence=95% or 0.95

z would represent the statistic (variable of interest)

p_v represent the p value (variable of interest)  

Hypothesis

We need to conduct a hypothesis in order to test the claim that true proportion of people that their approval rating might have changed is 0.58 or no.:  

Null hypothesis:p=0.58  

Alternative hypothesis:p \neq 0.58  

Part a

z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}} (1)  

Calculate the statistic  

Since we have all the info requires we can replace in formula (1) like this:  

z=\frac{0.684 -0.58}{\sqrt{\frac{0.58(1-0.58)}{114}}}=2.250  

Part b: Statistical decision  

The significance level provided \alpha=0.05. The next step would be calculate the p value for this test.  

Since is a bilateral test the p value would be:  

p_v =2*P(z>2.250)=0.0244  

If we compare the p value and the significance level given we see that p_v we have enough evidence to reject the null hypothesis at 5% of significance.

You might be interested in
Combine like terms 7a - a+ 16 = ?
dexar [7]
6a+16

Explanation:
If there's just a variable, there's an understood 1 in front of it. So what that really says is:

7a-1a+16

So, you combine the a's. 7a minus 1a is 6a. Same as 7-1,but you have a variable stuck on the end of it.

6a+16

:^)
4 0
3 years ago
Read 2 more answers
NO LINKS OR ANSWERING WHAT YOU DON'T KNOW?
snow_lady [41]

Answer:

1. D. 1

2. B. y=a³/x

3. A. y=1/x

Step-by-step explanation:

too long to give te explanations but they're there in the attachments

7 0
2 years ago
Can someone help me !
rosijanka [135]

Answer:

B

Step-by-step explanation:

It's the only one with an addition sign...... seems logical, let me know if you got it correct

7 0
3 years ago
Whats the slope form?
Furkat [3]

Answer:

the slope intercept form is y=mx+b

4 0
3 years ago
Read 2 more answers
Why are circles so important in creating equilateral triangles
Daniel [21]
Maybe because the diameter of the circle should equal each side length of te equilateral triangle 
6 0
2 years ago
Other questions:
  • 48 is half of what number the number is half of 192?
    15·1 answer
  • What is math compass used for ?
    12·1 answer
  • How to solve the sum of two numbers is 13. twice the larger increased by three times the smaller is 31. find the numbers?
    12·1 answer
  • What are the common factors for 88 and 112
    6·2 answers
  • Prove that opposite sides of a parallelogram are congruent.
    5·1 answer
  • While bowling with friends, Brandy rolls a strike in 4 out of 10 frames. What is the experimental probability that Brandy will r
    11·1 answer
  • Write the polynomial in standard form. Then name the polynomial based on its degree and number of terms.
    8·1 answer
  • What is the percent for 220
    6·2 answers
  • Please help due today { only EVENS} Mark Brainliest and 31 points
    14·1 answer
  • I’m little confused can any explain? <br><br><br> (NO LINK PLS &lt;3)
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!