Food safety. Example 26.5 describes a study of the attitudes of people attending outdoor fairs about the safety of the food served at such locations. The data set contains the responses of 303 people to several questions. The variables in this data set are (in order)

 

                           subject       hfair        sfair    sfast    srest    gender

 

The variable “sfair” contains responses to the safety question described in Example 26.5. The variables “srest” and “sfast” contain responses to the same question asked about food served in restaurants and in fast-food chains. Explain carefully why we cannot use the Kruskal-Wallis test to see if there are systematic differences in perceptions of food safety in these three locations.

 

Example 26.5:

 

STATE: Food sold at outdoor fairs and festivals may be less safe than food sold in restaurants because it is prepared in temporary locations and often by volunteer help. What do people who attend fairs think about the safety of the food served? One study asked this question of people at a number of fairs in the Midwest: “How often do you think people become sick because of food they consume prepared at  utdoor fairs and festivals?” The possible responses were

 

                                           

 

In all, 303 people answered the question. Of these, 196 were women and 107 were men.4 We suspect that women are more concerned than men about food safety. Is there good evidence for this conclusion?

 

 

View less »