A survey of 66 randomly selected students finds that they spend a mean of $440 per semester. Assume that the population standard deviation is $53 per month. Confidence Interval: What is the 90% confidence interval to estimate the population mean? Round your answers to two decimal places. < μμ <

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A: Given DataMean = 100Standard deviation = 15Probability of IQ score of adults = 0.3446

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A: We have given that,  Z = (X - μ)/σ  what does calculate the above formula?

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Q: IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the IQ…

A: Excel formula: =NORMINV(0.305,0,1)=-0.5100

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Q: Construct a confidence interval of the population proportion at the given level of confidence. x=…

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Q: Construct a confidence interval of the population proportion at the given level of confidence.…

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A: From the given information,  and .

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A: Given that, n=6,c=0.9 The degree of freedom is,

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Q: Hospital Noise Levels Noise levels at various area urban hospitals were measured in decibels. The…

A: Given that n=169