Business sensor technology provides a way for companies to learn about their customers, employees, and operations; data captured from sensors can be used to improve engagement, sales, productivity, safety, and much more. A PwC survey of global business and IT executives found that 25% of automotive executives; 27% of energy, utilities, and mining executives; 30% of hospitality and leisure executives; 33% of industrial products executives; and 52% of retail and consumer executives say their companies are currently investing in business sensor technology. (Data extracted from three surprising digital bets for 2015, pwc.to/1H8jcOY.) Suppose these results were based on 500 business and IT executives in each of the five industries: Automotive; Energy, Utilities, and Mining; Hospitality and Leisure; Industrial Products; and Retail and Consumer.

a. At the 0.05 level of significance, is there evidence of a difference among the industries with respect to the proportion of executives that say their companies are currently investing in business sensor technology?

b. Compute the p-value and interpret its meaning.

c. If appropriate, use the Marascuilo procedure and a = 0.05 to determine which companies differ in their current investing in business sensor technology.