Data Analysis Assignment
BUS 6860
Spring 2010 Instructions: Provide answers to each of the following questions in a Word document. You are a business analyst and the audience is your manager, who is bright but has not taken USU’s BUS 6860. Explain your answers thoroughly but concisely, and present them in a professional manner. Some questions only require two or three sentences for an answer and explanation (e.g., question 4), and others require up to a full page to provide a complete analysis (e.g., question 8). With the exception of question 8, all questions are worth 10 points. You may do this exercise alone or you may work with one other person. Please submit only one assignment between the two of you, with both names at the top …ver más…

When the p-value is below the chosen significance level the alternative hypothesis is supported.

3. Quality Motors is an automobile dealership that regularly advertises in its local market area. It claims that a certain make and model of car averages 30 miles to a gallon of gas and mentions that this figure may vary with driving conditions. A local consumer group wishes to verify the advertising claim. To do so, it selects a sample of recent purchasers of this make and model. It asks them to drive their cars until they have used two tanks of gas and to record the mileage. The group then calculates and records the miles per gallon for each car. Following are the results of the tests:

Purchaser | Miles per Gallon | Purchaser | Miles per Gallon | 1 | 30.9 | 14 | 27.0 | 2 | 24.5 | 15 | 26.7 | 3 | 31.2 | 16 | 31.0 | 4 | 28.7 | 17 | 23.5 | 5 | 35.1 | 18 | 29.4 | 6 | 29.0 | 19 | 26.3 | 7 | 28.8 | 20 | 27.5 | 8 | 23.1 | 21 | 28.2 | 9 | 31.0 | 22 | 28.4 | 10 | 30.2 | 23 | 29.1 | 11 | 28.4 | 24 | 21.9 | 12 | 29.3 | 25 | 30.0 | 13 | 24.3 |

H0: µ=30
H1: µ ≠30
A two tail t-test is the more appropriate statistical test for the hypothesis. The decision rule on the t-test based on the fact that the sample size is less than 30 which limits us from using a Z-test.