What is the value of mu_s = ? The value of mu^-_s is. The value of sigma_x is. I

Question

What is the value of mu_s = ? The value of mu^-_s is. The value of sigma_x is. If the sample size is n = 9, what is likely true about the shape of the population? The shape of the population is skewed left. The shape of the population is normal. The shape of the population is skewed right. The shape of the population cannot be determined. If the size is n = 9, what is the standard deviation of the population from which the sample was drawn? The standard deviation of the population from which the sample was drawn is.

Explanation / Answer

a)

As we can see, the mean is at the center,

u(X) = 700 [ANSWER]

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b)

As we can see, the inflection points are 30 units away (730-700=30) from the mean. Hence,

sigma(X) = 30 [ANSWER]

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c)

9 is a small sample size. Hence, as the sampling distribution already looks normal although the sample size is small, the the original population must be normal by its own, so

OPTION B: Normal. [ANSWER]

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d)

As

sigma(X) = sigma/sqrt(n)

Then

sigma = sigma(X) sqrt(n) = 30*sqrt(9) = 90 [ANSWER]

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