Owners of a chain of ice cream shops recently examined sales figures and noticed

Question

Owners of a chain of ice cream shops recently examined sales figures and noticed t on a randomly selected day, 21 of 103 ice cream customers from their shop located in the eastern part of the state ordered soft serve ice cream, while 29 of 132 ice cream customers from their shop located ill the western part of the state ordered soft serve ice cream. Construct a 95% confidence interval to find the difference in proportions of customers who favor soft serve ice cream in the two parts of the state. (21 / 103 - 29 / 132) plus-minus 1.96 21 / 103 (1 - 21 / 103) / 103 + 29 / 132 (1 - 29 / 132) / 132 (21 / 103 - 29 / 132) plus-minus 1.96 21 / 103 (1 - 21 / 103) / 103 + 21 / 103 (1 - 21 / 103) / 103 (21 / 103 - 29 / 132) plus-minus 1.96 29 / 132 (1 - 29 / 132) / 132 + 29 / 132 (1 - 29 / 132) / 132 (21 / 103 - 29 / 132) plus-minus 1.96 21 / 103 (1 - 21 / 103) / 103 + 29 / 132 (1 - 29 / 132) / 132 (21 / 103 - 29 / 132) plus-minus 1.96 50 / 235 (1 - 50 / 235)(1 / 103 + 1 / 132)

Explanation / Answer

Answer: A

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