STATISTICAL TECHNIQUES AND TOOLS
SAMPLING DISTRIBUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It is known that the mean of the population of unicorns equals 1000, and the standard deviation equals 25. In a group of 20 randomly selected unicorns, what is the standard deviation of the sampling distribution?
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25
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1.25
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5.59
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40
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4
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Explanation:
Detailed explanation-1: -Answer: B. 0.8523 Explanation: First, find the z-score: (18-19.32) / 2.4 =-0.55. Then, look up the z-score in a standard normal table or use a calculator to find the probability: 1-0.1477 = 0.8523.
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