in each of the following situations, indicate the statistical analysis you would conduct and the appropriate test or test statistic that should be used.

a Consumer preferences for Body Shop shampoo were obtained on an 11-point Likert scale. The same consumers were then shown a commercial about the Body Shop. After the commercial, preferences for the Body Shop were again measured. Has the commercial been successful in inducing a change in preferences?

b Does the preference for Body Shop shampoo follow a normal distribution?

c Respondents in a survey of 1,000 households were classified as heavy, medium, light and non-users of ice cream. They were also classified as being in high-, medium- or low-income categories. Is the consumption of ice cream related to income level?

d In a survey of 2,000 households, respondents were asked to rank