the average length of a hospital stay for all diagnoses is 4.8 days. If we assume that the length of the hospital stay are normally distributed with a variance of 2.1, then 10% of hospital stays are longer than how many days? Thirty percent of stays are less than how many days?

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Q: To obtain a maximum amount of variance, an item ought to have a degree of difficulty of what?

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Q: what is its distribution, its mean and its variance?

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Q: An analysis of variance produces SSb = 30, SSw = 60, F-ratio with df = 2, 15.      For this…

A: From the provided information, SSb = 30 and SSw = 60 Degree of freedom (k - 1) = 2 And (n - k) = 15

Q: If a variable Y correlates with a variable X with a Pearson Correlation of .62, how much of the…

A: Hey there! Thank you for posting the question. Since there are multiple questions posted, we will…

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Q: What is the variance of X

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Q: A sample of n=4 has test scores of 0, 0, 12, 12 What is the range, the variance and the standard…

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Q: Scores on a certain exam are normally distributed with a mean of 90 and a variance of 25. What is…

A: X : score obtained in a exam Given X ~ N(90,25) So, Z = X-905 ~ N(0,1)

Q: A recent article reported “A one-way analysis of variance found that GRE scores varied according to…

A: Note: Hi there! Thank you for posting the question. As your question has more than 3 parts, we have…

Q: A sample of n = 16 scores has a mean of M = 40 and a variance of s2 = 128.  What is the estimated…

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Q: The standard error of a 16-unit sample of a variable with a mean of 20 and a variance of 64

A: Given data,Mean μ=20Variance σ2=64standard deviation =Varianceσ=64σ=8If n=16Standard error(σx)=?

Q: What does it mean that the variance (computed by dividing by N) is a biased statistic?

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A: Solution: From the given information, r=0.20.

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A: Estimated standard Error of Mean =    Given, n=9 S2=36 Therefore substitute n,S2   in above…

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Q: The blood pressure and weight if Jellystone Park bears are correlated and .6 is the correlation…

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Q: following results. Do the populations have different variances at 5% level of significance?

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A: Solution To test the equality of means the F test is used .

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A: Given,  n = 16 μ = 4x¯ = 7σ = 4α = 0.05

Q: the homogeneity of variances assumption states that the variance in the two samples must be equal?…

A: Homogeneity of variances always make about the population variance not about sample.

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A: Given, n = 20 X¯ = 32S2=2S = 1.4142      To find, test the hypothesis that the population mean age…

Q: sample with SS=30 and a variance of s2 =10 has n=4 scores. True or False?

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.