Discuss the following problem:
For the following questions, identify the level of measurement and whether the method to be used for the problem would parametric (P) or non-parametric (NP).
Description of Problem P or NP? Nominal, Ordinal, Ratio, or Interval?
a. From a written survey where the respondents were asked to rate an individual on a scale of 1 to 5, one group rated an individual a 3.7, another group rated the individual a 4.3. Is the difference statistically significant?
b. A comparison of salaries between male and female employees in the same organization.
c. A catering company is buying equipment in order to set up their own store. They have a choice of two ovens that they can purchase for the store. The used oven is $100 less than the new oven, but its heating calibration is off by 20 degrees. Which one is a better buy for them?
d. Mel's Diner has been surveying their customers for the past couple of years about their dining experience in the restaurant. The survey uses a scale of one to five, five being best to indicate customer satisfaction. Mel's customer satisfaction averaged 2.5 last year, but this year it is 2.9. Is this difference statistically significant?