12% of the residents of one town are aged over 70. The distribution of sample proportions of samples of 210 residents is normal with a mean of 0.12 and a standard deviation of 0.022.
Suppose that you select a sample of 210 residents and find that the proportion aged over 70 in the sample is 0.09. What is the z-score corresponding to this sample proportion?

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The Answer of 12% of the residents of one town are aged over 70. The distribution of sample proportions of samples of 210 residents is normal with a mean of 0.12 and a standard deviation of 0.022.
Suppose that you select a sample of 210 residents and find that the proportion aged over 70 in the sample is 0.09. What is the z-score corresponding to this sample proportion?

12% of the Residents of One Town Are Aged Over