Question

Asked Dec 9, 2019

4 views

A group of 9 concertgoers was selected at random. Before the concert they were given a hearing test, and then given another one after the concert. (The volume varied during the test, and the subject also had to state which ear the sound was in.) Here are the number of correctly identified sounds out of 10, both before and after theconcert.

At the 0.05 level of significance, test a person’s hearing is worse after being affected by the noise of a concert.

Person |
A |
B |
C |
D |
E |
F |
G |
H |
I |

Before |
9 |
10 |
9 |
8 |
8 |
9 |
9 |
9 |
8 |

After |
8 |
8 |
9 |
6 |
6 |
7 |
10 |
8 |
5 |

Step 1

The appropriate Null and Alternative Hypotheses are given below:

From the given information, the claim of the problem is the person’s hearing is worse after being affected by the noise of a concert.

** **

**Null hypothesis:**

* *

*H*0: µbefore= µafter.

That is, the person’s hearing is same for before and after being affected by the noise of a concert.

**Alternative hypothesis:**

* *

*H*1: µafter< µbefore.

** **

That is, the person’s hearing is worse after being affected by the noise of a concert.

Here, the hearing test is given for **same persons** are compared. Hence, the appropriate test for given testing is **paired t test**.

The test statistic is **-3.266** and it is obtained below:

**Excel Procedure:**

- Enter the data for before and after...

Tagged in

Find answers to questions asked by student like you

Show more Q&A

Q: Detail The US Department of Housing and Urban Development provides data to show the fair...

A: The null and alternative hypotheses are shown below:H0: The mean fair market rent is same for each m...

Q: A. fill in the table B. for alpha=.01 (one tail) would you reject H0 before 7 6 8 7 5 4 6 aft...

A: Note:- Complete statement is not given. So assuming it is a problem of paired t-test and Lower Test....

Q: A racing car consumes a mean of 103 gallons of gas per race with a variance of 36. If 38 racing c...

A: The probability of the sample mean would be greater than 101.5 gallons is 0.9382 and it is obtained ...

Q: Candy Counts Color Number in Package Red 1313 Orange 2424 Yellow ...

A: Given data and calculation of expected candy is shown below

Q: Can you do a, b, c?

A: The provided information are;Probability of success (p) = 0.5Number of trials (n) = 10

Q: Question 6

A: 6.The null and alternative hypotheses are stated below:

Q: Assume that a sample is used to estimate a population mean μμ. Find the 99.5% confidence interval fo...

A: IntroductionThe 100 (1 – α) % confidence interval for the population mean, μ, for given sample stand...

Q: Find z such that 96% of the standard normal curve lies to the left of z

A: The total area under the normal curve is equal to 1 and contains 100% of all probabilities. Z score...

Q: Match the definitions or illustrations below to their correct terms. The stated level of risk the re...

A: Type I error (α):Type I error is defined as the probability of rejecting the null hypothesis when it...