A certain soft drink bottler claims that less than 10% of its customers drink another brand of

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A certain soft drink bottler claims that less than 10% of its customers drink another brand of soft drink on a regular basis.A random sample of 100 customers yielded 18 who did in fact drink another brand of soft drink on a regular basis.

Do these sample results support the bottler’s claim? (Use a level of significance of 0.05.) LO.1 

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