4.14 Find the proportion X of individuals who can be expected to respond to a certain mail-order solicitation if X has the density function | 2(=+2), 0

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A: Answer  Given  Mean = 5 Minimum value = 4.5 Maximum value =5.1 We know that: Variance = [Range/4]^2.

Q: The variance statistic is an unbiased estimator of the population variance.

A: here  ,  suppose population variance is σ2 sample variance is s2

Q: how to find the variance?

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A: Given that  Sample size n1=20 , n2=20 Sample variance s12=42.3 s22=47.6

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