STATISTICAL TECHNIQUES AND TOOLS
T DISTRIBUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The 90% interval for a statistics test has a sample mean of 72 and an EBM of 7. What is the lower bound for the interval?
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7
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72
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65
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79
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Explanation:
Detailed explanation-1: -EBM = z n z n = the error bound for the mean, or the margin of error for a single population mean; this formula is used when the population standard deviation is known.
Detailed explanation-2: -Suppose we want to find z/2 for some test that is using a 90% confidence level. In this case, would be 1 – 0.9 = 0.1. Thus, /2 = 0.1/2 = 0.05.
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