It is known that one in ten consumers favor a certain brand of potato chips. After a promotional campaign in a particular sales region, a random sample of 200 people were interviewed to study the effect of this campaign. (a) Derive the test to compare the null hypothesis that the campaign had no effect on people's opinion of this brand of potato chips against the alternative hypothesis that there was an increase in the favorability of this brand of chips. (b) Using the test you obtained in part (a), what conclusions do you draw if 26 of those interviewed favored that particular brand of chips.

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