Sampling Distribution of Proportion: County bank customers
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Historically, the percentage of Countybank customers who are happy with customer service has been 63%. Suppose we wish to use the results of a survey of 500 Countybank customers to justify the claim that more than 63% of all current customers are happy with customer service. The survey finds that 330 of 500 randomly selected Countybank customers are happy with customer service.
Assume the proportion of happy customers is p = .63, calculate the probability of observing a sample proportion greater than or equal to 330/500 = 0.66.
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Solution Summary
The solution provides step by step method for the calculation of probability using the Z score. Formula for the calculation and Interpretations of the results are also included.
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Sampling Distributions
Historically, the percentage of County bank customers who are happy with customer service has been 63%. Suppose we wish to use the results of a survey of 500 County bank customers to ...
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