Last Updated 01 Sep 2020

# Business Statistics Assignment

## Assignment for Midterm Break

1. Most of the information technology developers claim that wireless connection would give a speed of at least 11 Mbps compared to a wired connection. A sample of 105 computers using wireless connection shows it gives a mean of 11. 7 Mbps and a standard deviation of 2. 3 Mbps.

a) Do you think that wireless usage should be implemented? (Test at a 7% significance level).

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b) Repeat the test by using a p-value approach.

2. A jack is usually used for raising the axle of a motor so that a wheel may be changed. It is known that the weight of the vehicle that is raised by a jack is more than 100kg. a random sample of 125 jacks with a mean of 102. 2kg and a standard deviation of 15. 17kg is taken.

a) Do you agree that a jack can raise more than a 100 kg vehicle? (use α = 0. 03)

b) Repeat the test by using a p-value approach.

3. In a normal situation, on average, a song needs a duration of at most 3. 5 minutes to be played. The duration of a random sample of 11 songs is taken, and the data are as follows:

- 5. 32
- 6. 53
- 4. 52
- 3. 20
- 3. 39
- 4. 00
- 4. 10
- 3. 15
- 3. 47
- 4. 01
- 2. 3

a) By using the data, do you agree with the statement that a song needs a duration of at most 3. 5 minutes to be played? (use α = 0. 05)

b) Repeat the test by using a p-value approach.

4. A researcher needs on average, 1. 2 years to complete his short-term research. A random sample of 12 researchers are taken, and the duration (in years) to complete their research are recorded as below:

- 4. 3
- 1. 0
- 1. 5
- 1. 6
- 1. 2
- 0. 8
- 2. 1
- 2. 4
- 0. 7
- 1. 3
- 0. 4

a) Do these data support the stamen that a researcher needs exactly 1. 2 years to complete his research? (use α =0. 05)

b) Repeat the test by using a p-value approach.

5. Newly purchased automobile tyres of a certain type are supposed to be filled with a pressure of at most 34 psi. A random sample of 36 such tyres was selected and it gives a sample mean of 34. 66 psi and a standard deviation of 2. 14 psi.

a) Does this sample prove that such tyres fill with a pressure of at most 34 psi? (Use 7% significance level).

b) Repeat the test by using a p-value approach.

QMT2033 BUSINESS STATISTICS

6. In a labor-management discussion it was brought up that workers at a certain large plant, take on average at least 32. 6 minutes to get to work. If a random sample of 60 workers took on an average of 33.0 minutes with a standard deviation of 6.1 minutes, what can you conclude based on the sample taken? (Use 0. 017 level of significance). Repeat the test by using a p-value approach.

7. A manufacturer has developed a new fishing line, which he claims has a mean breaking strength of 15 kilograms with a standard deviation of 0. 5 kilograms. To test the eligibility of the claim, a random sample of 50 lines has been tested and it gave a mean of 14. 9 kilograms. Can you help the manufacturer to test his claim? (Use a significance level of 0. 08). Repeat the test by using a p-value approach.

Remember. This is just a sample.

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Business Statistics Assignment. (2016, Dec 07). Retrieved from https://phdessay.com/business-statistics-assignment/