Thousand purchasers of a new car receive the questionnaire in Fig. 9.47. For the examples below, indicate the scale and a suitable statistical test for the given variables. Are the samples dependent or independent?

(a) Do private car owners and company car owners differ with regard to the postal code they are living in?

(b) Do private car owners and company car owners differ with regard to initial impression of build quality?

(c) Does the mean number of years respondents drove their previous vehicle deviate from five?

(d) Do private car owners and company car owners differ with regard to the number of previously owned cars of the same brand?

(e) Does the overall satisfaction of customers with their new car differ from their satisfaction with the vehicle’s interior?

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Questionnaire 1. Indicate the postal code of your city: 2. What is your initial impression of the new car? a) Overall b) Exterior very satisfied satisfied dissatisfied c) Interior d) Build quality 3. I drove my previous car for 4. My car is a: private car 5. How many cars of the same brand have you previously owned? years. Fig. 9.47 Questionnaire for owners of a particular car company car