10.13 Andrews (1989) examines attitudes toward advertising by undergraduate marketing students at universities in six different geographic regions. Attitudes were measured by answers to a questionnaire that allowed responses on a 7-point Likert scale (1¼strongly disagree and 7¼strongly agree). Three statements on the questionnaire related to the social dimension were (1) most advertising insults the intelligence of the average consumer; (2) advertising often persuades people to buy things they shouldn’t buy; and (3) in general, advertisements present a true picture of the product being advertised. For the mean scores given below, determine whether there are any regional differences in attitude for the social dimension.

Region Insults Persuades True Picture Northwest 3.69 4.48 3.69 Midwest 4.22 3.75 3.25 Northeast 3.63 4.54 4.09 Southwest 4.16 4.35 3.61 South Central 3.96 4.73 3.41 Southeast 3.78 4.49 3.64