A large manufacturing company produces computer printers that are distributed and sold all over Canada. Due to lack of industry information, the company has a difficult time ascertaining its market share in different parts of the country. It hires a market research firm to estimate its market share in an Alberta city and an Ontario city. The company would also like to know whether there is a difference in its market shares in these two cities; if so, it wants an estimate of the size of the difference. The market research firm randomly selects printer customers from different locales across both cities and determines what brand of computer printer they purchased. The following summary shows the results from this study. Discuss the results, including sample sizes, estimation of the difference in proportions, and any significant differences determined. What hypotheses were tested?

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Test and CI for Two Proportions Sample X 147 1 2 104 N 473 385 Difference = p (1)-p (2) Estimate for difference: 0.0406524 Sample p 0.310782 0.270130 99% CI for difference: (-0.0393623, 0.120667) Test of difference = 0 (vs not =) 0: z = 1.31 p-Value = 0.191