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16 January, 11:14

Until recently a number of professions were prohibited from advertising. In 1977, the U. S. Supreme Court ruled that prohibiting doctors and lawyers from advertising violated their right to free speech. The paper "Should Dentists Advertise?" Journal of Advertising Research, June 1982) compared the attitudes of 101 consumers and 124 dentists to the questions "I favor the use of advertising by dentists to attract new patients". Determine whether the two groups differed in their attitudes toward advertising.

Group Strongly Agreed Agree Neutral Disagree Strongly disagree

Cosumers 34 47 9 6 5

Dentists 9 18 23 28 46

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  1. 16 January, 11:27
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    the two groups differed in their attitudes toward advertising, significantly

    Step-by-step explanation:

    given that until recently a number of professions were prohibited from advertising. In 1977, the U. S. Supreme Court ruled that prohibiting doctors and lawyers from advertising violated their right to free speech. The paper "Should Dentists Advertise?" Journal of Advertising Research, June 1982) compared the attitudes of 101 consumers and 124 dentists to the questions "I favor the use of advertising by dentists to attract new patients".

    Hypotheses would be

    H-0: the groups do not differ

    H-a: The two groups differ significantly

    (two tailed chi square test)

    Observed

    Group Strongly agree Agree Neutral Disagree Strongly disagree Total

    Consumers 34 47 9 6 5 101

    Dentists 9 18 23 28 46 124

    Expected is calculated as row total * column total / grand total for each cell

    chi square = (obs - exp) ^2/Exp for each cell added

    chi square = 79.2716

    rxc 5x2

    df = 4x1 = 4

    p value <0.00001

    Since p < alpha say 0.01, we reject null hypothesis.

    the two groups differed in their attitudes toward advertising, significantly
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