Social media users use a variety of vices to access social networking; mobile phones are increasingly popular. However, is there a difference in the various age groups in the proportion of social media users who use their mobile phone to access social networking? A study showed the following results for the different age groups:

Assume that 200 social media users for each age group were surveyed.
a. At the 0.05 level of significance, is there evidence of a difference among the age groups with respect to use of mobile phone for accessing social networking?
b. Determine the p-value in (a) and interpret its meaning.
c. If appropriate, use the Marascuilo procedure and a = 0.05 to determine which age groups differ with respect to use of a mobile phone for accessing social networking.
d. Discuss the implications of (a) and (c). How can marketers use this information to improve their sales return on investment (ROI)?

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AGE USE MOBILE PHONE TO ACCESS SOCIAL NETWORKING? Yes No 18-34 35-64 65+ 59% 36% 13% 41% 64% 87%