Suppose you are the manager of Speedy Oil Change which claims that it will change the oil in​ customers’ cars in less than 30 minutes on average. Further suppose that several complaints have been filed from customers stating that their oil change took longer than 30 minutes. ​ Upper-level management at Speedy Oil Change headquarters has requested that you investigate the complaints. To begin your​ investigation, you randomly audit 36 oil changes performed by Speedy Oil Change and record the time each customer waited for the oil change. The number of minutes to complete each of the 36 oil changes is reported below.
Suppose you are the manager of Speedy Oil Change which claims that it will change the oil in​ customers’ cars in less than 30 minutes on average. Further suppose that several complaints have been filed from customers stating that their oil change took longer than 30 minutes. ​ Upper-level management at Speedy Oil Change headquarters has requested that you investigate the complaints. To begin your​ investigation, you randomly audit 36 oil changes performed by Speedy Oil Change and record the time each customer waited for the oil change. The number of minutes to complete each of the 36 oil changes is reported below.
42
29
19
11
10
27
41
27
22
26
28
32
17
15
25
35
32
22
13
31
17
30
33
25
18
24
28
21
40
19
34

30
14
23
22
10
1. Write the null and alternative hypothesis. Label each accordingly.
2. Calculate the Test Statistic and the​ P-value. Label each​ accordingly, and report the​ P-value to 4 decimal places.
3. Using the​ P-value calculated in​ #2, explain why you would or would not reject the null​ hypothesis? Answer using a complete​ sentence, proper grammar and correct spelling. Do NOT write a conclusion.
4. Based on your answer to​ #3, write a final conclusion for the test of​ hypotheses, and explain if the company is fulfilling its promise to​ “change the oil in​ customers’ cars in less than 30 minutes on​ average?” Answer using a complete​ sentence, proper grammar and correct spelling.

Answers

Answer 1

The null hypothesis is that the average time to change the oil in customers' cars is 30 minutes or less. The alternative hypothesis is that the average time to change the oil in customers' cars is more than 30 minutes

How to explain the hypothesis

The p-value is the probability of obtaining a t-value as extreme or more extreme than the observed value, assuming the null hypothesis is true. Using a t-distribution table or a statistical software, we can calculate the p-value as 0.0081

The test statistic as:

= 24.58, s = 8.40, n = 36

t = (24.58 - 30) / (8.40 / ✓(36))

= -2.76

Since the p-value (0.0081) is less than the significance level (0.05), we can reject the null hypothesis.

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Related Questions

PLEASE HELP THIS WAS DUE ON 03/16/2023 THIS IS A CONSTRUCTED RESPONSE
In the past, your school allowed two free tardies to each class before a detention was assigned, now students only have one free tardy before they are assigned detention.

You have been assigned to write a letter to the principal of your school protesting the new "Only One Free Tardy per Class" policy.


In your letter, please list at least three reasons that you think that the "Only One Tardy" policy needs to be changed. Address your letter to Dr. Smithsonian.

Answers

Answer:

Explanation:

Dear Dr. Smithsonian,

I am writing to express my concern and protest regarding the new "Only One Free Tardy per Class" policy. As a student of this school, I believe that this policy is unfair and should be changed for the following reasons:

Punishing students for being late to class is not an effective way to promote punctuality. While it is important to encourage students to arrive on time, punishing them for tardiness is not a productive solution. Instead, the school should consider alternative methods of encouraging punctuality, such as incentivizing students who arrive on time or addressing underlying issues that may be causing students to be consistently late.

The "Only One Free Tardy" policy does not take into account extenuating circumstances that may cause a student to be late. There are many situations that are beyond a student's control, such as traffic or a family emergency, that could cause them to be late to class. Punishing these students for circumstances that are beyond their control is unfair and does not promote a positive learning environment.

The policy creates unnecessary stress and anxiety for students. The fear of being punished for being late can cause students to feel anxious and stressed, which can ultimately have a negative impact on their academic performance. By removing this policy, the school can create a more relaxed and positive learning environment that will allow students to focus on their studies and succeed academically.

In conclusion, I strongly believe that the "Only One Free Tardy per Class" policy is unfair and should be changed. As a school, we should be focusing on creating a positive and supportive learning environment that encourages academic success, rather than punishing students for being late. Thank you for your attention to this matter.

Sincerely,

{YOUR NAME}

PLEASE HELP
One debate in education is over whether or not students need to learn to read and write in cursive.

Make the argument either FOR or AGAINST the idea that students need to learn to read and write in cursive. In a paragraph, provide at least three reasons to support your argument.

Answers

Answer:

Argument FOR learning cursive:

Learning cursive is important for several reasons. Firstly, cursive writing can improve fine motor skills and hand-eye coordination. Secondly, cursive writing can help individuals read historical documents, which are often written in cursive. Finally, cursive writing can also help students write more efficiently, as they don't need to lift their pen as often as they do with print writing.

Argument AGAINST learning cursive:

There are several reasons why learning cursive is unnecessary. Firstly, with the advent of technology, the need for handwriting in general has decreased significantly. Secondly, learning cursive can be time-consuming, and that time could be spent learning more useful skills. Finally, some people find cursive difficult to read, and printing is more legible for them.

Explanation:

factors involved in expertise include:
(a) talent
(b) aptitude
(c) practice & motivation
(d) all​

Answers

The factors involved in expertise include practice and motivation, as well as other factors such as talent and aptitude. Therefore, option (d) all of the above is the correct answer. While some people may have natural talent or aptitude for a particular skill or area of knowledge, sustained practice and motivation are essential for developing expertise in any field.

What were the two new attitudes of Americans, regarding Native American music towards the turn of
the century?

Answers

Answer:

I'm not quite sure what specific turn of the century you are referring to. However, if you're asking about the turn of the 19th century, then one of the new attitudes towards Native American music was appreciation, as some Americans developed an interest in the music of Native American cultures. The other was appropriation, as some Americans sought to use Native American music for their own purposes, rather than respecting its cultural significance.

Explanation:

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