|Suppose that you wanted to know if children's attention spans have decreased. You collect a sample and find a confidence interval of (18.44, 26.48) minutes. What is the sample mean and margin of error for the confidence interval? Show your work. Mark which is the mean and which is the margin of error.

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A: a) It is given that n =2550 and x=1020.

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A: 96.2% CS = ? (1 - ∞) 100% = 96.2% (1 - ∞) = 0.962 ∞ = 0.038   Z = NOR MSINV (∞/2)     = 2.075…

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A: Given:-Researchers find 95% CI from sample statistics.We have to find correct statement.

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A: For 90 % CI , α =0.1 Zα2= 1.645 (+NORMSINV(0.05) --Excel function)) ___________________ For 95% CI ,…