A quality engineer analyzed the paint job on the Lexus IS350 model at the Toyota plant in Woodstock. 250 cars were analyzed. The drying time (in hours) and colour of paint were recorded.
(i) Determine the variable(s) in the study,
(ii) Describe the type of data for each variable in the study (e.g., univariate, bivariate, categorical and ordinal or non-cardinal, numerical and continuous or discrete, etc.),
(iii) Determine the observational unit, and
(iv) Find out the sample size.