What is the pooled standard deviation? What degrees of freedom are used in doing inferences for these means and differences in means? Round your answer for the pooled standard deviation to two decimal places. The pooled standard deviation is degrees of freedom = i

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A: Given Using standard normal table P(Z>z) =15%

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A: Z= x-μσ~N(0,1)

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A: Given: μ = 5.4 σ = 2.2 Formula Used: Percentile = μ+Z×σ

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A: Note: Thank you for the question. Since multiple subparts are posted, according to our policy, we…

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A: Given: Formula:

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A: Given that, Sample size n=50 Probability of US workforce that has no drug problem p=0.86

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A: Given that  Let X denotes the student score normal distribution with mean=μ and standard deviation σ…