Summarize the lengths of the pencils produced by machines

Assignment Help Applied Statistics

Reference no: EM131713524

Assessment: Collaborative Project

You work for the Quality Assurance Department of a manufacturing company. Your company manufactures pencils. Machine A, Pencil Maker, is set to produce pencils of mean length 190mm with a standard deviation of 0.1mm. Machine B, Pencil Giant, produces pencils of mean length 190mm with a standard deviation of 0.2mm. Your boss believes that the machines are not producing pencils of correct length. As the Quality Assurance Officer, you must select a sample of pencils, measure the length of each pencil and use the data to determine whether your boss' claim is true.

(Each group will be given a different dataset to work with for this project)

(a) Identify your population of interest.

(b) What sampling technique would you use to select the sample for the study? Why?

(d) Use the frequency table to estimate the mean and median length of the pencils produced by both machines.

(e) Complete the contingency table below:

Machine	Exactly 190mm in length	Within 1 standard deviation of 190mm	More than 1 standard deviations of the 190mm	Total
Machine A
Machine B
Total

(f) Use the contingency table to find the probability that a randomly selected pencil from the sample:

(i) is from Machine A and exactly 190mm;

(ii) is from Machine A, given that it is 190mm;

(iii) is from Machine A or is exactly 190mm.

(g) Test the claim that the mean length of a pencil from Machine A is not 190mm. Use α = 0.10 and assume that the population is normally distributed.

(h) On the basis of your analysis, what would you tell your boss about Machine A?

(i) Another sample of 50 pencils were selected from Machine. The length and diameter of each pencil was measured and the data inputted in EXCEL. A scatter diagram was drawn using EXCEL. See the diagram below.

The correlation between the length of the pencil and the diameter of the pencil is 0.67. What does this indicate?

(j) The regression line generated by EXCEL for sample of 50 pencils is y = 0.7678x - 145.24 where y is the length of the pencil and x is the diameter. What is the expected diameter of a pencil with length 189.7mm?

Attachment:- Data Set.rar

Reference no: EM131713524

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Reviews

len1713524

11/9/2017 2:38:33 AM

Attached is the assignment and the data set that is to be used for the assignment. Assessment 3: Collaborative Project is the only question that is to be completed. Assessment 3 only! Students are required to conduct a mini-research project so as to apply statistical concept covered throughout the course. Students are expected to work together, in groups of 3 to 5, in a collaborative space, to discuss the questions and prepare the group’s project for submission.

len1713524

11/9/2017 2:38:27 AM

Students are expected to work together throughout the semester on this project. This assignment is to be prepared as a WORD document. The deadline for uploading this Project is 11:55pm EC Time on Friday, 17th. One member of the group is required to upload the project on behalf of the other members. Please ensure that all group members are listed on the cover page of the project. Upload your submission to the appropriate drop box for grading by your etutor.

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