SOLUTION: The statistical society claims the percent of people proficient at statistics is 15%. We sample 450 people and find 54 proficient at statistics. Find the z-score used in hypothesis
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Question 1114152: The statistical society claims the percent of people proficient at statistics is 15%. We sample 450 people and find 54 proficient at statistics. Find the z-score used in hypothesis testing. Standardized test statictics. Answer by rothauserc(4718) (Show Source):
You can put this solution on YOUR website! since we are looking for a z-score, we are dealing with a normal distribution
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the mean of the population is the mean of the sample, 0.15
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54/450 = 0.12
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sample standard error = square root(0.15 * 0.85 / 450) = 0.0168
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z-score = (0.12 - 0.15) / 0.0168 = −1.7857
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