A social psychologist has been studying the stress levels of people who live in cities compared with ...

A social psychologist has been studying the stress levels of people who live in cities compared with those who live in the suburbs. She had the people in her survey record the number of times during one week that they experienced a stressful situation, such as a driver cutting them off, a rude sales clerk, and so forth. Her research hypothesis is that suburban residents will have fewer stressful experiences or interactions than city dwellers. The data show that those who live in cities had an average of 14.2 stressful experiences; suburban residents had 12.5 stressful interactions, on average. From many past studies she estimates that the standard deviation of the variables of interest is 2.3 interactions for both rural and city residents. She included 80 city dwellers and 80 suburbanites in the study. State the appropriate research and null hypotheses, and test the null hypotheses at the .01 level of significance.