Question 711409: A toy company wants to determine the average amount of time it takes an adult to assemble a highly popular "easy to assemble " toy. A sample of 21 yielded an average time of 21.5 minutes, with a sample standard deviation of 6.5 minutes. Assuming normality of assembly times, construct a 95% confidence interval estimate for the assembly mean time for this popular toy. (Explain your findings so that your non-quantitative partner will understand them
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A toy company wants to determine the average amount of time it takes an adult to assemble a highly popular "easy to assemble " toy. A sample of 21 yielded an average time of 21.5 minutes, with a sample standard deviation of 6.5 minutes. Assuming normality of assembly times, construct a 95% confidence interval estimate for the assembly mean time for this popular toy. (Explain your findings so that your non-quantitative partner will understand them
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Sample mean: 21.5 min
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Margin of Error: 1.96 = 2.78
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95% CI: 21.5-2.78 < u < 21.5+2.78
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95% CI: 24.28 < u < 18.72
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Meaning: With 95% confidence we can say that the population
mean is betwen 24.28 and 18.72
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Cheers,
Stan H.
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